Update README.md

Links to documentation

README.md

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 Heaps
 =====
 
-High Performance Game Framework
+_High Performance Game Framework_
 
-http://heaps.io
+**Heaps** is a cross platform graphics engine designed for high performance games. It's designed to leverage modern GPUs that are commonly available on both desktop and mobile devices. The framework currently supports HTML5 WebGL, Flash Stage3D, native Mobile (iOS and Android) and Desktop with OpenGL.
+
+----
+* [Official website](http://heaps.io)
+* [Documentation](https://github.com/ncannasse/heaps/wiki)