Configure pre-commit tool for this repo

[webknjaz]

Rules:

1. DO NOT commit to master. ever.
2. ABSOLUTELY NO force pushes allowed for public non-feature branches.
3. For every feature, create a new branch matching name features/<issue-number>-<feature-name>.
4. Submit every feature by creating Pull Request @ github, after that wait for review, fix issues, repeat until approved. If needed rebase the branch on top of master and re-push force it.

• I HAVE READ AND UNDERSTOOD THE RULES ABOVE

---

• Install pre-commit locally as follows:

python3.9 -m pip install pre-commit --user
python3.9 -m pre_commit install

• Create branch called features/12-pre-commit-integration
• Add .pre-commit-config.yaml config, containing the following hooks:
  • no-commit-to-branch
  • add-trailing-comma
  • remove-tabs
  • trailing-whitespace
  • check-merge-conflict
  • double-quote-string-fixer
  • requirements-txt-fixer
  • check-yaml
  • check-docstring-first
  • end-of-file-fixer
  • name-tests-test
  • check-ast
  • debug-statements
  • flake8
  • pydocstyle
  • pylint using "local" mode
  • mypy
• Check repo using command pre-commit run --all-files, fix all issues and commit fixes as well
• Create PR with this branch