updated extensions table

src/SharpGLTF.Core/README.md

@@ -47,26 +47,54 @@ It also handles the way a mesh is brought from its local space to world space, i
 
 #### Extensions support
 
+- [x] [KHR_lights_punctual](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual)
+- [x] [KHR_mesh_quantization](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_mesh_quantization)
+- [x] [EXT_mesh_gpu_instancing](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Vendor/EXT_mesh_gpu_instancing)
+
 - [x] [KHR_materials_pbrSpecularGlossiness](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_pbrSpecularGlossiness)
+  - This extension has been declared _obsolete_ by Khronos, in favour of KHR_materials_specular + KHR_materials_IOR
+
 - [x] [KHR_materials_unlit](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_unlit)
-- [x] [KHR_lights_punctual](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual)
+- [x] [KHR_materials_clearcoat](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_clearcoat)
+- [x] [KHR_materials_emissive_strength](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_emissive_strength)
+- [x] [KHR_materials_IOR](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_ior)
+- [x] [KHR_materials_iridescence](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_iridescence)
+- [x] [KHR_materials_sheen](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_sheen)
+- [x] [KHR_materials_specular](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_specular)
+- [x] [KHR_materials_transmission](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_transmission)
+- [x] [KHR_materials_volume](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_volume)
+- [ ] [KHR_materials_variants](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_variants)
+  - This extension would require a full abstraction layer.
+
 - [x] [KHR_texture_transform](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_transform)
-- [ ] [KHR_draco_mesh_compression](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression)
-  - Depends on [Google's Draco Project](https://github.com/google/draco) which is C++ ; *Help Needed*
+- [x] [EXT_texture_webp](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_texture_webp)
+- [x] [MSFT_texture_dds](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_texture_dds)
+- [x] [KHR_texture_basisu](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_texture_basisu)
+
+- [x] [CESIUM_primitive_outline](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Vendor/CESIUM_primitive_outline)
+  - Extension provided by [@bertt](https://github.com/bertt)
+- [x] [AGI_articulations](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/AGI_articulations)
+  - Extension provided by [@emackey](https://github.com/emackey)
 
+- [ ] [KHR_xmp_json_ld](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_xmp_json_ld)
 - [ ] [KHR_techniques_webgl](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_techniques_webgl)
+  - This extension has been declared _obsolete_ by Khronos 
 
-- [x] [MSFT_texture_dds](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_texture_dds)
 - [ ] [MSFT_lod](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_lod)
   - When this extension is used, the model's visual tree needs to be abstracted, which requires an extensive API rework, or a full API layer.
+
+- [ ] [EXT_meshopt_compression](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Vendor/EXT_meshopt_compression)
+- [ ] [KHR_draco_mesh_compression](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression)
+  - Depends on [Google's Draco Project](https://github.com/google/draco) which is C++ and can't be easily linked.
+
 - [ ] [MSFT_packing_normalRoughnessMetallic](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_packing_normalRoughnessMetallic)
 - [ ] [MSFT_packing_occlusionRoughnessMetallic](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_packing_occlusionRoughnessMetallic)
-- [ ] [AGI_articulations](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/AGI_articulations)
+
 - [ ] [AGI_stk_metadata](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/AGI_stk_metadata)
 - [ ] [EXT_lights_image_based](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_lights_image_based)
-- [x] [EXT_texture_webp](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/EXT_texture_webp)
+
 - [ ] [ADOBE_materials_thin_transparency](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/ADOBE_materials_thin_transparency)
-- [x] [CESIUM_primitive_outline](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Vendor/CESIUM_primitive_outline)
+