C#/.Net port of Layout

[codecat]

Hi! As a little weekend project, I've ported Layout to C#/.Net. 🎉

Figured I'd make an issue and let anyone who may be looking for something like this know.

You can find the code here: https://github.com/codecat/Nimble.Layout

(The performance isn't as good as I want it to be, but it's at least functional and passes all tests.)

Of course, huge thanks to @randrew for this super solid library. I'm using it in a lot of different projects at this point! 😊