Add a linter to the backend

[ineshbose]

Is your feature request related to a problem?

Provide a clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Code linting is important for maintenance and review. It's just better practice.

Describe the solution you'd like

Please provide a clear and concise description of what you want to happen.

Adopt Black linting along with a GitHub Action that checks everything to be linted.

Describe alternatives you've considered

Please provide a clear and concise description of any alternative solutions or features you've considered.

Django does not adopt Black traditionally, but a lot of people are still going ahead with it. There are linters for Django as well, but Black blows many out of the water, and also there is previous experience with Black.

[ineshbose]

/cib

[github-actions]

Branch feature/12-add_a_linter_to_the_backend created for issue #12: Add a linter to the backend