Update Readme.md

Add doc for glTF2.0 for supported extenstions

Readme.md

@@ -60,7 +60,12 @@ __Importers__:
 - ENFF
 - [FBX](https://en.wikipedia.org/wiki/FBX)
 - [glTF 1.0](https://en.wikipedia.org/wiki/GlTF#glTF_1.0) + GLB
-- [glTF 2.0](https://en.wikipedia.org/wiki/GlTF#glTF_2.0)
+- [glTF 2.0](https://en.wikipedia.org/wiki/GlTF#glTF_2.0):
+  At the moment for glTF2.0 the following extensions are supported:
+  + KHR_lights_punctual ( 5.0 )
+  + KHR_materials_pbrSpecularGlossiness ( 5.0 )
+  + KHR_materials_unlit ( 5.0 )
+  + KHR_texture_transform ( 5.1 under test )
 - HMB
 - IFC-STEP
 - IRR / IRRMESH