Render Backend in OpenGl with OpenTK.NETCore

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Render Backend in OpenGl with OpenTK.NETCore
https://www.nuget.org/packages/OpenTK.NETCore/
https://github.com/opentk/opentk
https://medium.com/@cameronaavik/cross-platform-graphics-in-net-core-901be29dabd7
https://github.com/shintadono/OpenGL.Core