Adding readme.md for Blender exporter

Exporters/Blender/readme.md

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+Blender to Babylon.js exporter
+==============================
+
+The [Blender export plugin](http://blogs.msdn.com/b/eternalcoding/archive/2013/06/28/babylon-js-how-to-load-a-babylon-file-produced-with-blender.aspx) supports the following features:
+
+* **Cameras**
+ * Name
+ * Position
+ * Target
+ * Fov
+ * Clip start
+ * Clip end
+ * Check collisions
+ * Gravity
+ * Ellipsoid
+* **Lights**
+ * Type (Point, directional (Sun), Spot, Hemispheric)
+ * Name
+ * Position
+ * Direction
+ * Spot size
+ * Spot blend 
+ * Energy
+ * Diffuse color
+ * Specular color
+* **Materials**
+ * Name
+ * Ambient color
+ * Diffuse color
+ * Specular color
+ * Specular hardness
+ * Emissive color
+ * Alpha
+ * Backface culling
+ * Diffuse texture
+ * Ambient texture
+ * Opacity texture
+ * Reflection texture
+ * Emissive texture
+ * Bump texture
+* **Multi-materials**
+ * Name
+ * Child materials
+* **Textures**
+ * Name
+ * Associated file
+ * Level
+ * Use alpha
+ * uOffset / voffset
+ * uScale / uScale
+ * uAng / vAng / Wang
+ * WrapU / WrapV
+ * Coordinates index
+* **Meshes**
+ * Name
+ * Geometry (Positions & normals)
+ * Position
+ * Rotation
+ * Scaling
+ * Texture coordinates (2 channels)
+ * Vertex colors
+ * Visibility
+ * Check collisions
+ * Billboard
+ * Receive and cast shadows
+ * Bones (armatures) and bones' animations
+ * Animations
+
+
+
+
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