Add starship prompt example

[redbeardymcgee]

Simple starship prompt format with a custom module. It's possible to change the symbol, or remove it entirely in favor of something like:

[custom.yazi]
when = """ test -n "$YAZI_LEVEL" """
command = """ echo "| Yazi " """

Screenshots don't seem to be stored with the repo, but I can share one.

[redbeardymcgee]

[Sonico98]

Thank you very much!