Add black auto-formatter github action/workflow

[Iapetus-11]

This GitHub action runs on pushes to the repository, and auto-formats Python code in the black style, I use it for most of my projects and it helps keep everything tidy! This particular workflow/action waits for commits, checks to see if anything needs to be auto-formatted, and if there is it creates a commit for it.

You can read more about black here.

[Iapetus-11]

As you can see it ran on my fork already, and formatted all the code nicely.