Add git-wip and git-resume

[gabebw]

You write down what you want to work on next, commit it, and then resume when you come back.

https://github.com/gfontenot/dotfiles/blob/main/local/bin/git-wip

https://github.com/gfontenot/dotfiles/blob/main/local/bin/git-resume

[teoljungberg]

This is really neat! I might steal this too.