Improve Documentation

The Timetable project needs enhanced [`TypeHints`](https://docs.python.org/3/library/typing.html), [`Documentation`/`docstrings`](https://peps.python.org/pep-0257), etc...

Following the [`pep-8`](https://peps.python.org/pep-0008) conventions as a style guide, it should support for all [python>=3.11](https://docs.python.org/3/whatsnew/3.11.html).