chore: add implicit keyboard binding example

embedding/.gitignore

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+node_modules/
+public/

embedding/README.md

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+# bpmn-js embedding example
+
+This example shows how different versions of the toolkit can be embedded easily into a HTML page.
+
+Keyboard binding and focus handling is done natively, as you expect from other elements on the canvas. For more information see [pull request](https://github.com/bpmn-io/diagram-js/pull/662) and [changelog](https://github.com/bpmn-io/diagram-js/blob/develop/CHANGELOG.md#1500) for `diagram-js` v15.0.0.
+
+## About
+
+This example embedds different variants of the BPMN toolkit into a larger website. You can see how each instance of modeler only captures keyboard shortcuts when it's focused and doesn't interfer with other (native or custom) elements.
+
+![demo application screenshot](https://raw.githubusercontent.com/bpmn-io/bpmn-js-examples/main/embedding/docs/screenshot.png "Screenshot of the example application")
+
+## Building
+
+You need a [NodeJS](http://nodejs.org) development stack with [npm](https://npmjs.org) installed to build the project.
+
+To install all project dependencies execute
+
+```
+npm install
+```
+
+Spawn the demo by executing
+
+```
+npm start
+```
+
+Both tasks generate the distribution ready client-side modeler application into the `public` folder.