Update readme.md

Exporters/3ds Max/readme.md

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 This exporter is designed for 3ds Max 2013+. You just have to unzip the content of the archive to [3ds max folder\bin\assemblies]
 
-## Supported features
+If you right click on the scene, on a light, on a camera or on a mesh you fill have a [Babylon...] menu. 
+
+To export you can use the [Babylon] menu in the main menu bar.
+
+## Exported features
 - *Scene*
  - Clear color
  - Ambient color