chore: set up repository pipeline with linter

[amiicao]

A pipeline is an integral structure used to hold stages of development. Add a pipeline to the repository with a linter stage to keep code consistent amongst devs and prevent errors.

TODO:

• create pipeline
• create lint stage
• use the linters black & flake8

See the following linters:

1. black
2. flake8

[dannyl1u]

see https://pypi.org/project/pylint/

[amiicao]

Flake8 is too slow on my local machine. PyLint is supposedly even slower than Flake8. I am opting for a more modern linter: Ruff