Adds custom native widget example

Author: a7ul

nodegui/custom-native-widget-qpainter/.gitignore

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+node_modules
+dist/
+*.log
+.vscode

nodegui/custom-native-widget-qpainter/README.md

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+# Custom Native Widget built using QPainter from NodeGui
+
+An example of powerful QPainter from Qt in NodeGui that you can use to build completely custom native widgets using Javascript.
+The example showcases how to build a widget that looks and behaves like an analog clock.
+
+**PS: Keep in mind the whole clock in just one single widget**
+
+### Screenshots
+
+<img alt="demo_mac" src="https://github.com/nodegui/examples/raw/master/nodegui/custom-native-widget-qpainter/assets/analog-clock.gif" width="100%" />
+
+## To Use
+
+To clone and run this repository you'll need [Git](https://git-scm.com) and [Node.js](https://nodejs.org/en/download/) (which comes with [npm](http://npmjs.com)) installed on your computer.
+
+Make sure you have met the requirements listed here: https://docs.nodegui.org/#/tutorial/development-environment
+
+From your command line:
+
+```bash
+# Install dependencies
+npm install
+# Run the app
+npm start
+```
+
+## Resources for Learning NodeGUI
+
+- [docs.nodegui.org](https://nodegui.github.io/nodegui) - all of NodeGui and React Desktop's documentation
+
+## Extra info
+
+This is a javascript version of QPainter example using NodeGui from here: https://doc.qt.io/qt-5/qtgui-analogclock-example.html
+
+## License
+
+MIT