Contributor suggestion - Early Pull Requests

[MV10]

Hey Ian, while searching around for decent .NET OpenGL wrappers, I ran across this description of a pull request style that I thought was clever. I know you've said you haven't had a lot of contributor activity, but I've been making somewhat large changes in single PRs, and I think this style of work might simplify reviewing and collaboration when they do happen. Now that I think about it, I've noticed Microsoft often works this way in the .NET repos, too, though I haven't seen the process described formally.

https://github.com/opentk/opentk/#contributing