update README

README.md

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-#R3 3D (and 2D eventually)
+#R3 3D
+######
+
+A 3D library - based on the Entity Component System model - with the following features:
+
+Blender file import (import objects directly from .blend files)
+Saving and Loading of 3D objects to and API
+
+Supports:
+ * Multiple materials textures
+ * Variety of materials
+ * Cubemaps
+ * Stereo camera
+ * Custom shaders
+