[Lang] C# snippets

[hoakbuilds]

The goal is to add snippets for the existing recipes for C#.

In some recipes it may be the case that features haven't yet been implemented/properly tested in the Solnet.* ecosystem of libraries, should we just skip those? Open to suggestions.

[jacobcreech]

Awesome. Any snippets are fine. We're skipping some of the CLI sections that are not supported at this time, so filling out what you can is good

[hoakbuilds]

Ok cool, I'll get started with some :)