Create a test directory

[AdrianDAlessandro]

Take inspiration from the poetry template test directory.

This will require adding pytest as a dependency. If the plan is to use pip and a requirements.txt for defining dependencies (as opposed to conda), then I would suggest create a separate requirements file for defining development dependencies called requirements-dev.txt and to include pytest in that. This is because it will not be a dependency for running the software (ie training the model), only for running the tests.

[emilymuller1991]

done