Proposal: add snapshot testing

[304NotModified]

For some cases snapshot testing is a lot better than asserting by hand.

Libraries:

• https://github.com/VerifyTests/Verify (1.3 million downloads on NuGet)
• https://github.com/SwissLife-OSS/snapshooter (1.2 million downloads on NuGet)
• older, not maintained; https://github.com/approvals/ApprovalTests.Net (3.7 million downloads on NuGet)

[MoienTajik]

I'm ok with that. Could you send a PR for it please?

[304NotModified]

Nope sorry, i dont have (or want) xMind