CI test

[ppasupat]

Description

Added continuous integration tests. The tests are run in Docker containers with Python 3.7-3.10 and headless Chrome 107. Similar to other repos in Farama Foundation, the changes will be run on GitHub upon push and pull request.

The directories are also restructured to resemble a module, but no functionality has been changed (i.e., the interface is not yet the Gymnasium interface; this will be addressed in a different pull request).

Fixes #11.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

Thanks for the PR, with the CI added, I think we can look at the port gymnasium API with the CI now