Update README.md

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README.md

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-# glTF2Sharp
+# glTF2Sharp
+
+glTF2Sharp is NetStandard 2.0, C# library designed to parse and create [Khronos Group glTF2](https://github.com/KhronosGroup/glTF) files.
+
+The current status of the library is preview status, but, for some cases it is probably fully usable.
+
+In particular, Loading ans saving both *.gltf* and binary *.glb* files is already fully supported.
+