Add --help Command to tsr

[mattpocock]

Not having a help command in tsr breaks my expectations about how CLI's should behave.

Not necessarily urgent, but annoying enough that I felt I wanted to raise an issue.

[schiller-manuel]

absolutely valid. want to create a PR for that?

[AhmedBaset]

All of tsr, @tanstack/create-start and @tanstack/create-router already have --help