Add github-actions to set up automated tests

This issue needs to be addressed after the issue on making TACOCAT installable: https://github.com/fastresearchgroup/TACOCAT/issues/51

From @veeshy - https://github.com/veeshy:

"Structure looks good for the scope the original article mentioned. Next good steps would be to make the project installable so you can import it from anywhere, [pyproject-toml](https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/) and that would **lead nicely into using GitHub-actions to setup [automated tests](https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python)"**