Suggestion in readme updating info

[MauNguyenVan]

IMO, you should update Which OpenGL versions and OS platforms this project supported

[bitzhuwei]

It potentially supports all OpenGL versions and OS platforms.(I think so) But now I have no time to support linux/mac/android etc. I'm focusing on converting the Assimp project into C# implementation. @MauNguyenVan

[MauNguyenVan]

So, have you binding SharpGL for all versions of openGL or just use the lastest version (openGL 46), How can I check it,
I will update in readme

[bitzhuwei]

1. Check WinGLRenderContext.Create.cs, it trys to get latest openGL version available on the machine.
2. Check GL.functions.cs, it contains all openGL function pointers(as GL's field members) in gl.commands.xml. I got that from https://github.com/KhronosGroup/OpenGL-Registry
3. Check GL.ctor.cs, it trys to find function implementation and return the function pointer for every glXxx in GL using Reflection. So, whenever openGL API is updated by KhronosGroup, we only need to update the GL's field members according to the new version of gl.commands.xml.
4. If a glXxx() is not supported by the machine, the gl.Xxx will be 0x00000000(null). That's when and how user knows if the machine supports some openGL command.
   I'm not good at dealing with the annoying version problem. I'll be thankful if you can do some help. @MauNguyenVan