Added contributor information regarding pre-commit

[cansik]

Since it is not clear just because the file is around, I added a short chapter about how to format the code to contribute. Maybe it even makes sense to bump the isort version anyways to at least 5.12.0.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (226d8cc) 74.80% compared to head (1e19269) 74.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #549      +/-   ##
==========================================
- Coverage   74.80%   74.76%   -0.05%     
==========================================
  Files          71       71              
  Lines        4695     4695              
  Branches      731      731              
==========================================
- Hits         3512     3510       -2     
- Misses        986      987       +1     
- Partials      197      198       +1     

Flag	Coverage Δ
unittests	74.76% <ø> (-0.05%)	:arrow_down:

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[cansik]

Same issue about nanodet/model/arch/one_stage_detector.py. No idea why this fails now and didn't before. I am only changing the README.md.