[Doc] add readme for js packages (#421)

* add contributor

* add package readme

* refine ocr readme

* refine ocr readme

examples/application/js/package/packages/paddlejs-models/detect/README.md

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+[中文版](./README_cn.md)
+
+# detect
+
+detect model is used to detect the position of label frame in the image.
+
+<img src="https://img.shields.io/npm/v/@paddle-js-models/detect?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/detect" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/detect?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/detect" alt="downloads">
+
+# Usage
+
+```js
+import * as det from '@paddle-js-models/detect';
+
+// Load model
+await det.load();
+
+// Get label index, confidence and coordinates
+const res = await det.detect(img);
+
+res.forEach(item => {
+    // Get label index
+    console.log(item[0]);
+    // Get label confidence
+    console.log(item[1]);
+    // Get label left coordinates
+    console.log(item[2]);
+    // Get label top coordinates
+    console.log(item[3]);
+    // Get label right coordinates
+    console.log(item[4]);
+    // Get label bottom coordinates
+    console.log(item[5]);
+});
+```
+
+# effect
+![img.png](https://user-images.githubusercontent.com/43414102/153805288-80f289bf-ca92-4788-b1dd-44854681a03f.png)
+

examples/application/js/package/packages/paddlejs-models/detect/README_cn.md

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+[English](./README.md)
+
+# detect
+
+detect模型用于检测图像中label框选位置。
+
+<img src="https://img.shields.io/npm/v/@paddle-js-models/detect?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/detect" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/detect?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/detect" alt="downloads">
+
+# 使用
+
+```js
+import * as det from '@paddle-js-models/detect';
+
+// 模型加载
+await det.load();
+
+// 获取label对应索引、置信度、检测框选坐标
+const res = await det.detect(img);
+
+res.forEach(item => {
+    // 获取label对应索引
+    console.log(item[0]);
+    // 获取label置信度
+    console.log(item[1]);
+    // 获取检测框选left顶点
+    console.log(item[2]);
+    // 获取检测框选top顶点
+    console.log(item[3]);
+    // 获取检测框选right顶点
+    console.log(item[4]);
+    // 获取检测框选bottom顶点
+    console.log(item[5]);
+});
+```
+
+# 效果
+![img.png](https://user-images.githubusercontent.com/43414102/153805288-80f289bf-ca92-4788-b1dd-44854681a03f.png)
+

examples/application/js/package/packages/paddlejs-models/facedetect/README.md

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+[中文版](./README_cn.md)
+
+# Facedetect
+
+Facedetect is used for face detection in image. It provides a simple interface. At the same time, you can use your own model.
+
+<img src="https://img.shields.io/npm/v/@paddle-js-models/facedetect?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/facedetect" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/facedetect?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/facedetect" alt="downloads">
+
+# Usage
+
+```js
+import { FaceDetector } from '@paddle-js-models/facedetect';
+
+const faceDetector = new FaceDetector();
+await faceDetector.init();
+// Required parameter：imgEle(HTMLImageElement)
+// Optional parameter: shrink, threshold
+// Result is face area information. It includes left, top, width, height, confidence
+const res = await faceDetector.detect(
+    imgEle,
+    { shrink: 0.4, threshold: 0.6 }
+);
+```
+
+# Performance
++ **multi small-sized face**  
+  <img width="500"  src="https://mms-voice-fe.cdn.bcebos.com/pdmodel/face/detection/pic/small.png"/>
+
++ **single big-sized face**  
+  <img width="500"  src="https://mms-voice-fe.cdn.bcebos.com/pdmodel/face/detection/pic/big.png"/>
+
+# Postprocess
+This model has a better recognition effect for small-sized faces, and the image will be shrink before prediction, so it is necessary to transform the prediction output data.  
+<img width="500"  src="https://mms-voice-fe.cdn.bcebos.com/pdmodel/face/detection/pic/example.png"/>  
+The red line indicates the predicted output result, and the green line indicates the converted result. dx dy fw fh are known parameters.
+
+# Reference
+[original model link](https://github.com/PaddlePaddle/PaddleHub/tree/release/v2.2/modules/image/face_detection/pyramidbox_lite_mobile)

examples/application/js/package/packages/paddlejs-models/facedetect/README_cn.md

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+[English](./README.md)
+
+# Facedetect
+
+Facedetect 实现图像中的人脸检测，提供的接口简单，支持用户传入模型。
+
+<img src="https://img.shields.io/npm/v/@paddle-js-models/facedetect?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/facedetect" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/facedetect?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/facedetect" alt="downloads">
+
+# 使用
+
+```js
+import { FaceDetector } from '@paddle-js-models/facedetect';
+
+const faceDetector = new FaceDetector();
+await faceDetector.init();
+// 使用时必传图像元素（HTMLImageElement），支持指定图片缩小比例（shrink）、置信阈值（threshold）
+// 结果为人脸区域信息，包括：左侧 left，上部 top，区域宽 width，区域高 height，置信度 confidence
+const res = await faceDetector.detect(
+    imgEle,
+    { shrink: 0.4, threshold: 0.6 }
+);
+```
+
+# 效果
++ **多个小尺寸人脸**  
+  <img width="500"  src="https://mms-voice-fe.cdn.bcebos.com/pdmodel/face/detection/pic/small.png"/>
+
++ **单个大尺寸人脸**  
+  <img width="500"  src="https://mms-voice-fe.cdn.bcebos.com/pdmodel/face/detection/pic/big.png"/>
+
+# 数据后处理
+此人脸检测模型对小尺寸人脸具有更好的识别效果，图像在预测前会进行缩小，因此需要对预测输出数据进行变换，及为**数据后处理过程**。示意如下：  
+<img width="500"  src="https://mms-voice-fe.cdn.bcebos.com/pdmodel/face/detection/pic/example.png"/>  
+红线标识的是预测输出结果，绿线标识的是经过转换后的结果，二者变换过程所涉及到的 dx dy fw fh均为已知量。
+
+# 参考
+[源模型链接](https://github.com/PaddlePaddle/PaddleHub/tree/release/v2.2/modules/image/face_detection/pyramidbox_lite_mobile)

examples/application/js/package/packages/paddlejs-models/humanseg/README.md

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+[中文版](./README_cn.md)
+
+# humanseg
+
+A real-time human-segmentation model. You can use it to change background. The output of the model is gray value. Model supplies simple api for users.
+
+Api drawHumanSeg can draw human segmentation with a specified background.
+Api blurBackground can draw human segmentation with a blurred origin background.
+Api drawMask can draw the background without human.
+
+
+<img src="https://img.shields.io/npm/v/@paddle-js-models/humanseg?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/humanseg" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/humanseg?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/humanseg" alt="downloads">
+
+# Usage
+
+```js
+
+import * as humanseg from '@paddle-js-models/humanseg';
+
+// load humanseg model, use 398x224 shape model, and preheat
+await humanseg.load();
+
+// use 288x160 shape model, preheat and predict faster with a little loss of precision
+// await humanseg.load(true, true);
+
+// get the gray value [2, 398, 224] or [2, 288, 160];
+const { data } = await humanseg.getGrayValue(img);
+
+// background canvas
+const back_canvas = document.getElementById('background') as HTMLCanvasElement;
+
+// draw human segmentation
+const canvas1 = document.getElementById('back') as HTMLCanvasElement;
+humanseg.drawHumanSeg(data, canvas1, back_canvas) ;
+
+// blur background
+const canvas2 = document.getElementById('blur') as HTMLCanvasElement;
+humanseg.blurBackground(data, canvas2) ;
+
+// draw the mask with background
+const canvas3 = document.getElementById('mask') as HTMLCanvasElement;
+humanseg.drawMask(data, canvas3, back_canvas);
+
+```
+
+## gpu pipeline
+
+```js
+
+// 引入 humanseg sdk
+import * as humanseg from '@paddle-js-models/humanseg/lib/index_gpu';
+
+// load humanseg model, use 398x224 shape model, and preheat
+await humanseg.load();
+
+// use 288x160 shape model, preheat and predict faster with a little loss of precision
+// await humanseg.load(true, true);
+
+
+// background canvas
+const back_canvas = document.getElementById('background') as HTMLCanvasElement;
+
+// draw human segmentation
+const canvas1 = document.getElementById('back') as HTMLCanvasElement;
+await humanseg.drawHumanSeg(input, canvas1, back_canvas) ;
+
+// blur background
+const canvas2 = document.getElementById('blur') as HTMLCanvasElement;
+await humanseg.blurBackground(input, canvas2) ;
+
+// draw the mask with background
+const canvas3 = document.getElementById('mask') as HTMLCanvasElement;
+await humanseg.drawMask(input, canvas3, back_canvas);
+
+```
+
+# Online experience
+
+image human segmentation：https://paddlejs.baidu.com/humanseg
+
+video-streaming human segmentation：https://paddlejs.baidu.com/humanStream
+
+# Performance
+
+  <img width="800"  src="https://user-images.githubusercontent.com/10822846/126873788-1e2d4984-274f-45be-8716-2a87ddda8c75.png"/>
+  <img width="800"  src="https://user-images.githubusercontent.com/10822846/126873838-e5b68c9b-279f-4cb4-ae90-6aaaecd06aa4.png"/>
+
+
+# Used in Video Meeting
+  <p>
+  <img width="400"  src="https://user-images.githubusercontent.com/10822846/126872499-c3fd680e-a01b-4daa-b0cb-acd3290862bd.gif"/>
+  <img width="400"  src="https://user-images.githubusercontent.com/10822846/126872930-4f4c5c5d-5c51-44fe-b2d6-3f83c4e124bc.png"/>
+  </p>

examples/application/js/package/packages/paddlejs-models/humanseg/README_cn.md

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+[English](./README.md)
+
+# 人像分割
+
+实时的人像分割模型。使用者可以用于背景替换。需要使用接口 getGrayValue 获取灰度值。
+然后使用接口 drawHumanSeg 绘制分割出来的人像，实现背景替换；使用接口 blurBackground 实现背景虚化；也可以使用 drawMask 接口绘制背景，可以配置参数来获取全黑背景或者原图背景。
+
+<img src="https://img.shields.io/npm/v/@paddle-js-models/humanseg?color=success" alt="version"> <img src="https://img.shields.io/bundlephobia/min/@paddle-js-models/humanseg" alt="size"> <img src="https://img.shields.io/npm/dm/@paddle-js-models/humanseg?color=orange" alt="downloads"> <img src="https://img.shields.io/npm/dt/@paddle-js-models/humanseg" alt="downloads">
+
+# 使用
+
+```js
+
+// 引入 humanseg sdk
+import * as humanseg from '@paddle-js-models/humanseg';
+
+// 默认下载 398x224 shape 的模型，默认执行预热
+await humanseg.load();
+
+// 指定下载更轻量模型, 该模型 shape 288x160，预测过程会更快，但会有少许精度损失
+// await humanseg.load(true, true);
+
+
+// 获取分割后的像素 alpha 值，大小为 [2, 398, 224] 或者 [2, 288, 160]
+const { data } = await humanseg.getGrayValue(img);
+
+// 获取 background canvas
+const back_canvas = document.getElementById('background') as HTMLCanvasElement;
+
+// 背景替换， 使用 back_canvas 作为新背景实现背景替换
+const canvas1 = document.getElementById('back') as HTMLCanvasElement;
+humanseg.drawHumanSeg(data, canvas1, back_canvas) ;
+
+// 背景虚化
+const canvas2 = document.getElementById('blur') as HTMLCanvasElement;
+humanseg.blurBackground(data, canvas2) ;
+
+// 绘制人型遮罩，在新背景上隐藏人像
+const canvas3 = document.getElementById('mask') as HTMLCanvasElement;
+humanseg.drawMask(data, canvas3, back_canvas);
+
+```
+
+## gpu pipeline
+
+```js
+
+// 引入 humanseg sdk
+import * as humanseg from '@paddle-js-models/humanseg/lib/index_gpu';
+
+// 默认下载 398x224 shape 的模型，默认执行预热
+await humanseg.load();
+
+// 指定下载更轻量模型, 该模型 shape 288x160，预测过程会更快，但会有少许精度损失
+// await humanseg.load(true, true);
+
+
+// 获取 background canvas
+const back_canvas = document.getElementById('background') as HTMLCanvasElement;
+
+// 背景替换， 使用 back_canvas 作为新背景实现背景替换
+const canvas1 = document.getElementById('back') as HTMLCanvasElement;
+await humanseg.drawHumanSeg(input, canvas1, back_canvas) ;
+
+// 背景虚化
+const canvas2 = document.getElementById('blur') as HTMLCanvasElement;
+await humanseg.blurBackground(input, canvas2) ;
+
+// 绘制人型遮罩，在新背景上隐藏人像
+const canvas3 = document.getElementById('mask') as HTMLCanvasElement;
+await humanseg.drawMask(input, canvas3, back_canvas);
+
+```
+
+# 在线体验
+
+图片人像分割：https://paddlejs.baidu.com/humanseg
+
+基于视频流人像分割：https://paddlejs.baidu.com/humanStream
+
+# 效果
+
+从左到右：原图、背景虚化、背景替换、人型遮罩
+
+  <img width="800"  src="https://user-images.githubusercontent.com/10822846/126873788-1e2d4984-274f-45be-8716-2a87ddda8c75.png"/>
+  <img width="800"  src="https://user-images.githubusercontent.com/10822846/126873838-e5b68c9b-279f-4cb4-ae90-6aaaecd06aa4.png"/>
+
+
+# 视频会议
+  <p>
+  <img width="400"  src="https://user-images.githubusercontent.com/10822846/126872499-c3fd680e-a01b-4daa-b0cb-acd3290862bd.gif"/>
+  <img width="400"  src="https://user-images.githubusercontent.com/10822846/126872930-4f4c5c5d-5c51-44fe-b2d6-3f83c4e124bc.png"/>
+  </p>
+