new docs organization

docs/Readme.md

 # Unity ML Agents Documentation
 
-## Basic 
+## About
- * [Installation & Set-up](installation.md)
- * [Getting Started with the Balance Ball Environment](Getting-Started-with-Balance-Ball.md)
-## Advanced
- * [How to make a new Unity Environment](Making-a-new-Unity-Environment.md)
- * [Best practices when designing an Environment](best-practices.md)
- * [Best practices when training using PPO](best-practices-ppo.md)
- * [How to organize the Scene](Organizing-the-Scene.md)
- * [How to use the Monitor](monitor.md)
+## Tutorials
+ * [Installation & Set-up](installation.md)
+ * [Getting Started with the Balance Ball Environment](Getting-Started-with-Balance-Ball.md)
+ * [Making a new Unity Environment](Making-a-new-Unity-Environment.md)
- * [How to use TensorflowSharp inside Unity [Experimental]](Using-TensorFlow-Sharp-in-Unity-(Experimental).md)
+
+## Features
+ * [Scene Organization](Organizing-the-Scene.md)
+ * [Curriculum Learning](curriculum.md)
+ * [Broadcast](broadcast.md)
+ * [Monitor](monitor.md)
- * [Training with Curriculum Learning](curriculum.md)
- * [How to use Broadcast](broadcast.md)
+ * [TensorflowSharp in Unity [Experimental]](Using-TensorFlow-Sharp-in-Unity-(Experimental).md)
+ 
+## Best Practices
+ * [Best practices when creating an Environment](best-practices.md)
+ * [Best practices when training using PPO](best-practices-ppo.md)
 
 ## Help
  * [Limitations & Common Issues](Limitations-&-Common-Issues.md)