Added materials for Docling vs LlamaParse tutorial

[nunombispo]

Where to put new files:

• New files should go into a top-level subfolder, named after the article slug. For example: my-awesome-article

How to merge your changes:

1. Make sure the CI code style tests all pass (+ run the automatic code formatter if necessary).
2. Find an RP Team member on Slack and ask them to review & approve your PR.
3. Once the PR has one positive ("approved") review, GitHub lets you merge the PR.
4. 🎉

[realpython-bot]

@stephengruppetta One-line README fix. The tutorial link in this README points at realpython.com/pdf-table-extraction-docling-vs-llamaparse/, which 403s. The CMS slug is now extract-table-from-pdf-python (changed today for the keyphrase), so the link needs to follow.

I checked the rest of the folder against the article while I was here: all five scripts match the tutorial's code blocks logically, and requirements.txt matches the article's install commands. No other drift.