Added Readme

readme.md

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+# is-url-relative-without-domain [![npm version](https://badge.fury.io/js/is-url-relative-without-domain.svg)](https://www.npmjs.com/package/is-url-relative-without-domain) [![Build Status](https://travis-ci.org/Arttse/node.is-url-relative-without-domain.svg?branch=master)](https://travis-ci.org/Arttse/node.is-url-relative-without-domain)
+
+> Node.js module. Check if URL is relative without domain
+
+
+## Install
+
+```
+$ npm install -S is-url-relative-without-domain
+```
+
+
+## Usage
+
+```js
+var isUrlRelativeWithoutDomain = require('is-url-relative-without-domain');
+
+isUrlRelativeWithoutDomain('/show/must?go=on');
+//=> true
+
+isUrlRelativeWithoutDomain('https://site.com');
+//=> false
+
+isUrlRelativeWithoutDomain('site.com/show/must?go=on');
+//=> false
+```
+
+
+## License
+
+MIT © Nikita «Arttse» Bystrov