Add example pre-commit based on this projects own pre-commit-config

[ddxv]

New to Godot and Gdscript but was excited to find a formatter/linter. Reading the README I thought it wouldn't work with pre-commit but tried anyways with the pre-commit-config.yaml in the project, was happy to see that it did.

If using this with pre-commit is an expected use case then I think it would good to have this in the README for new users.

[Scony]

Looks like a good idea. I'll give it a try in the upcoming days and merge it in case it works smoothly. Thanks for raising this.

[ddxv]

Thanks. I've been using it for a couple days in my pre-commit and it's working as expected. Are there any CLI extras or modifiers you might want to include in the example?