Add Game of Life and Langton's Loops cellular automaton series (Python, Programming for Lovers)

[phcompeau]

What is this?

• Title: Build the Game of Life and a Self-Replicating Cellular Automaton (Langton's Loops)
• URL: https://programmingforlovers.com/chapter-3-building-a-self-replicating-cellular-automaton-with-top-down-programming/chapter-3-python-code-alongs/introduction-to-two-dimensional-arrays/ (4 parts)
• Section: Python > Miscellaneous

A four-part Python code-along from Programming for Lovers. The reader works with 2D lists, draws boards with Pygame, implements Conway's Game of Life with command-line arguments and animated output, then generalizes the code into a rule-driven cellular automaton simulator that runs Langton's self-replicating loops. Each part has a video, full code, and a free starter code download.

Checklist

• This PR adds/fixes exactly one tutorial (or is a docs/tooling-only change).
• Free and open -- no paywall, login wall, or required newsletter signup.
• Project-based -- following it, the reader builds a complete, working artifact.
• I searched README.md for this URL and title -- it is not already listed.
• Entry uses - [Title](https://...) format, placed under the correct section (nested - [Part N](...) for multi-part series).
• No URL shorteners.
• I ran python3 scripts/check_readme.py lint locally and it exits 0.
• Relationship disclosure: I am the author. I (Phillip Compeau) wrote Programming for Lovers.

Lint exits 0, and check-links on the four added URLs returns 200 for each.

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