Add pip packages under pip.txt

[alisnwu]

closes #90

[bobleesj]

@alisnwu Thanks! Could you please try to make a PR from a non-main branch from your forked repo?

[sbillinge]

@alisnwu please also make sure you have pre-commit installed in your local env and you run pre-commit install. This will prevent you from accidentally making commits to main. Since you have accidentally made commits to main (and presumably pushed them to your fork), you will need to delete your local and your fork and refork and reclone (i.e., start over)