Merge branch 'master' of https://github.com/BabylonJS/Babylon.js

readme.md

@@ -9,6 +9,8 @@ Online [assets converter](http://www.babylonjs.com/converter.html) for .FBX, .DA
 
 Online [sandbox](http://www.babylonjs.com/sandbox) where you can test your .babylon scenes with a simple drag'n'drop
 
+Online [playground](http://www.babylonjs.com/playground) where you can interactively learn how to use babylon.js
+
 ## Documentation
 - [Wiki](https://github.com/babylonjs/babylon.js/wiki)
 - [Tutorials](https://github.com/BabylonJS/Babylon.js/wiki/Tutorials)