Fixes

In this PR I have added high-level diagrams for new people to get up-to-speed with the twilio-python codebase.
You can see how they will render here: https://github.com/CodeBoarding/GeneratedOnBoardings/blob/main/twilio-python/on_boarding.md

Me and a friend are working on this diagrams as we think this is the best way to get up-to-speed with new codebases. The way we generate them is via Static Analysis and LLMs. Any feedback is more than welcome!

Full disclosure: we're trying to turn this into a startup, but we're still in a very early stage and figuring out what will actually be useful for people.

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket, or create a GitHub Issue in this repository.