Reformat

I just ran black on the code stack. The only thing that really has changes is:

• adding some text to the readme on how to add a pre-commit hook
• add checks for lining the code, we can add more stuff, but for now I've just added black. I have the feeling that adding check with mypy will result is somewhat more work - hence our future problem.

@g300046 I hope this somewhat closes #37 (closed)

Also, I am not sure why the pipelines are failing. Shall I look into that?