Update README

Author: martinRenou

README.md

@@ -1,8 +1,10 @@
 
 # ipycanvas
 
+[![Documentation](http://readthedocs.org/projects/ipycanvas/badge/?version=latest)](https://ipycanvas.readthedocs.io/en/latest/?badge=latest)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/martinRenou/ipycanvas/stable?filepath=examples)
 
+
 Interactive widgets library exposing the [browser's Canvas API](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API) to Python. There are some API differences though:
 
 - The `Canvas` widget is exposing the [`CanvasRenderingContext2D`](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D) API
@@ -11,6 +13,16 @@ Interactive widgets library exposing the [browser's Canvas API](https://develope
 - We provide a `hold_canvas` context manager if you want to perform lots of commands at once
 - The Web canvas `putImageData` method does not support transparency, our `Canvas.put_image_data` **does** support it!
 
+## Try it online!
+
+You can try it online by clicking on this badge:
+
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/martinRenou/ipycanvas/stable?filepath=examples)
+
+## Documentation
+
+You can read the documentation following this link: https://ipycanvas.readthedocs.io/en/latest/
+
 ## Examples
 
 ### Create John Conway's Game Of Life