added anonymization cheatsheet summary to improve documentation

[tuck183]

This MR aims to improve the documentation for the pynonymizer tool by providing a cheat sheet. The cheat sheet contains quick strategy and patterns for anonymization.

[rwnx]

Thanks for the PR. I like the idea of a cheat sheet, but I have some concerns about the implementation:
The main issue is that this duplicates a lot of content from Faker's documentation. We intentionally rely on their docs rather than maintaining our own copies of strategy explanations - it's less maintenance overhead and avoids version drift.

This also covers similar ground to the existing README. Instead of having two intro documents, would it make more sense to either improve the main README or replace it entirely with this approach?

I'm also not sure how to predict which examples will actually be useful for most users. Everyone's anonymization needs are pretty different.

What if we focused this on pynonymizer-specific workflows and patterns, and kept references to Faker docs for the strategy details? That way we're adding value rather than duplicating existing documentation.

[tuck183]

Yes, this makes sense. I'll revisit this MR and apply changes as requested