mohitdjcet/fastAPI-Tutorial ? reverse-engineered prompt

Build me a simple FastAPI project that shows the basics clearly, since this is for learning and trying things out.

I want one main app file that runs an API with a few easy endpoints, including a home route, a health check, and a couple of example routes that return JSON. It should also show how to handle path parameters and query parameters, plus a small example of posting data and getting a response back. Please make the code clean and easy to follow, with a few comments where it helps.

If it makes sense, include sample data in memory so the app can demonstrate reading, adding, updating, and deleting items without needing a database. I’d also like the app to be ready to run right away with clear instructions in the file comments or a short note if needed. If you need to check current FastAPI docs online for best practices, go ahead and do that.