provide a list of available options for things like --gitignore or --license

example:
gh repo create --license -l

mit
etc.

gh repo create --gitignore -l

Go
Node

reason: I don't know whether it's Go or go and I don't find other way than trying until it works
also mit or MIT? what if I wanted to check if new licenses are getting added?
also idk if this is the best syntax for listing these options or not. knowing that it's not available on the docs