Merge pull request #463 from kgryte/demo-notebook

Add demo notebook

Author: fcollonval

README.md

@@ -7,6 +7,8 @@ A JupyterLab extension for version control using git
 
 ![](http://g.recordit.co/N9Ikzbyk8P.gif)
 
+To see the extension in action, open the example notebook included in the Binder [demo](https://mybinder.org/v2/gh/jupyterlab/jupyterlab-git/master?urlpath=lab).
+
 ## Prerequisites
 
 - JupyterLab