✨ Support use as a pre-commit hook

[danygielow]

Hi,

Thank you for implementing this useful tool.
I'd like to use auto-optional in my projects automatically by adding it to my pre-commit pipeline.

This PR adds a config to be able to use it in pre-commit.
I also added a section to the README describing how to use auto-optional with pre-commit.

[Luttik]

Hi @danygielow,

This is an amazing idea. I personally don't use pre-commit but I believe it is considered the way to go by many. I have two questions for now.

1. Is there something that we can add to CI that checks the pre-commit configuration?
2. Could you add the changes to the README.md also to docs/index.md (I still need a good way to sync the two and maintain relative URLs within mkdocs)?

[codecov-commenter]

Codecov Report

Merging #11 (bc596bb) into main (3f904c3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   73.04%   73.04%           
=======================================
  Files           5        5           
  Lines         115      115           
  Branches       21       21           
=======================================
  Hits           84       84           
  Misses         27       27           
  Partials        4        4           

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[Luttik]

Thanks again for your contribution @danygielow I've merged it and a new release action is now running to update the docs.