Add: Build a REST API with Express and TypeScript (JavaScript)

[unprx]

Adds a free, project-based tutorial to the JavaScript section: Build a REST API with Express and TypeScript.

The tutorial walks through building a working CRUD REST API for a task list using Express and TypeScript, with in-memory storage and all five routes (list, create, read, update, delete). Every file needed is inline on the page, so a reader can paste it into a fresh project and run it in about five minutes. No paywall, login wall, or newsletter signup required.

Disclosure: I'm affiliated with FreeCodingCourses.com, the site this tutorial is hosted on.

Checked against CONTRIBUTING.md:

• Not already in the README (searched by URL and title).
• Placed under JavaScript (the repo has no dedicated TypeScript section).
• Free and open, no paywall/login/signup.
• Project-based: the reader builds a complete, working REST API, not just a concept explainer.
• Ran python3 scripts/check_readme.py lint locally: 0 errors, 0 warnings.