An account on getting started with contributing code

This is a continuation thread for an ongoing discussion between @saehejkang and me that started here and here.

Not yet, but please feel free to try and let us know how that goes.

[docs] GettingStarted: Misc improvements to the Xcode setup instructions by AnthonyLatsis · Pull Request #68514 · apple/swift · GitHub

Yes—the binaries we use for testing IDE support, SourceKit, and other things one is not as likely to deal with (e.g. swift-ide-test). Here’s why.