Research internship project: write a dataset README someone else can use

Original invented practice inputs.

Task: A README, input manifest and reproduction instructions.

Start with input.json and the CSV tables. Record your method before opening answer-key.json. Keep a changed input and explain how its result differs.

Technical reading:
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-readmes

A result from this fixture is independent practice work; describe only work you actually complete.
