Add a Makefile to simplify the execution of tests, styling, and other Bash commands.

[truskovskiyk]

Ensure that we include a Makefile containing all the necessary development commands, such as how to run tests, perform releases, and execute style checks, among others.

For a great example, see the Makefile at: https://github.com/huggingface/transformers/blob/main/Makefile

[benjaminye]

Implementation Status
✅ Build
✅ Publish to PyPI
🟡 Run Tests
🟡 Run Styling