Glossary is missing '.gitignore' and 'README' #33

Context

Two files present in nearly every repository, including this one, and neither is explained anywhere on the site.

What to change

Files: data/glossary.json

Requirements:

• Add one object for .gitignore and one for README
• For .gitignore, mention that it is why __pycache__ never shows up in a pull request
• For README, mention that it is the first thing a visitor reads
• Keep entries sorted naturally — the page sorts them itself, so position in the file does not matter

Acceptance criteria

• Both terms appear on the glossary page
• The JSON still parses

How to verify locally

python3 -m http.server 8000

Then open http://localhost:8000.

Difficulty

Beginner.

New here? Comment /claim on this issue and a bot will assign it to you. Then read CONTRIBUTING.md.

Stuck at any point? Comment here saying what you have tried and where it stopped working — that is not an admission of failure, it is how we find out the instructions were unclear. You can also come to a PR Debug Clinic (Oct 12 or Oct 21).