Add Codeset to Additional Resources

[Nfsaavedra]

What is this?

• Title: Codeset
• URL: https://codeset.ai/
• Section: Additional Resources

Disclosure: I am a co-founder of Codeset.

Codeset is a project-based learning platform: you pick (or describe) what you want to build, get a full syllabus, and an AI tutor teaches each concept inside that project—lesson, apply in your workspace, then a short unaided test. The catalog covers languages like Python, C, Rust, Zig, and React, among others. Syllabuses are readable without an account; accounts start with free credits, then paid plans.

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 affiliated with the author or site

Note on “free and open”: syllabuses are public without login; learning past free credits requires a paid plan. Placed under Additional Resources next to similar platforms (e.g. CodeCrafters).

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