add pre-commit with black, flake8, isort checks

[nadasuhailAyesh12]

fiix #120

[codecov[bot]]

Codecov Report

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

Project coverage is 99.09%. Comparing base (3e8ba44) to head (8561fd9).

:exclamation: Current head 8561fd9 differs from pull request most recent head 373412f. Consider uploading reports for the commit 373412f to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #142 +/- ## ======================================= Coverage 99.09% 99.09% ======================================= Files 8 8 Lines 880 880 ======================================= Hits 872 872 Misses 8 8 ```

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[adbar]

Thanks, I'll test the PR first and then accept it if everything works.

[adbar]

There is something wrong with the flake8 dependency, it asks for a password.

We could also add mypy since we're at it and also the hooks suggested here:

# - repo: .. (mypy)
# ...
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.3.0
    hooks:
    -   id: check-yaml
    -   id: end-of-file-fixer
    -   id: trailing-whitespace

[adbar]

It works, thanks!