Add pre-commit framework config.

[ellieayla]

When multiple tools want to use the same .git/hooks/pre-commit script, need a framework to config and run them.

https://pre-commit.com/ is the current standard. Add .pre-commit-hooks.yaml.

[SiteRelEnby]

looks like language: unsupported_script means pre-commit won't install leash itself, so it already needs to be installed through the repo directions including making sure it's in $PATH, should add that to the readme. Otherwise someone might add the yaml config and wonder why they get leash: command not found.

Also, current release is v0.1.2, not 3. Otherwise, looks good.

[ellieayla]

language: unsupported_script means pre-commit won't "install" leash, it'll just clone the repo and execute leash directly from within, without being on the PATH. Did you pre-commit try-repo ../local/path/to/repo/of/git-leash/? Did it not do that?

(And I stuffed a hypothetical future version v0.1.3 in there because pre-commit shallow-clones the cited repo at the cited tag when trying to find .pre-commit-hooks.yaml - it definitely won't find the file at v0.1.2!)