Add isort/usort step

[cooperlees]

Summary:

• Been waiting for black to get import sorting but it never has made it in
• Due to this lets add usort or isort ability to run

[cooperlees]

This is added - Just forgot to add example to README.md. Will eventually unless someone beats me.

[cooperlees]

usort is done (now in README.md) and our sorter of choice.