Add support to run as a pre-commit hook

[luminoso]

I have made things!

I am adding .pre-commit-hooks.yaml to make it possible to run wemake-python-styleguide as a pre-commit hook.

The syntax is the same as flake8 repo (which is also generated via pre-commit try-repo command)

Checklist

• [x] I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc)
• [ ] I have created at least one test case for the changes I have made
• [x] I have updated the documentation for the changes I have made
• [x] I have added my changes to the CHANGELOG.md

Related issues

🙏 Please, if you or your company is finding wemake-python-styleguide valuable, help us sustain the project by sponsoring it transparently on https://opencollective.com/wemake-python-styleguide. As a thank you, your profile/company logo will be added to our main README which receives hundreds of unique visitors per day.

[rusmux]

Any updates on this?

[luminoso]

It looks like one validation is missing. I'll update it later for full conformity

[luminoso]

Everything looks ok. Tagging @sobolevn for visibility