Introducing pre-commit formatting of the code

[picjul]

Description

Introducing pre-commit formatting to assess code quality before commit. Using black formatter for Python.

Type of change

• New feature (non-breaking change which adds functionality)

How has this change been tested, please provide a testcase or example of how you tested the change?

pip install pre-commit
pre-commit install
pre-commit run --all-files

Any specific deployment considerations

Every contributor has to install pre-commit before commiting new changes. This will avoid commits with un-formatted code.

Docs

• Docs updated? What were the changes:
• Contributing.md added formatting step before commit

[CLAassistant]

All committers have signed the CLA.

[SkalskiP]

Hi @picjul 👋🏻 Thanks for your interest in RF-DETR. I'm not sure if introducing this feature like this is good idea. It will make code review incredibly hard. Even small change will end up refactoring whole file. If we do it we should auto-format whole code first.

[picjul]

OK, I can agree. But sooner or later I think it would be useful to introduce a similar mechanism, either by pre-commit or by introducing a step in Github actions. Why not start doing this now with the project still 'small' in size? 🤔