vigneshayyavar/Mern_demo ? reverse-engineered prompt

Build me a simple MERN demo app that feels like a real starter project, with a basic home page, a form to add items, and a list view that shows what was saved. I want the app to use a Node server on the backend, connect to MongoDB, and let me create, read, update, and delete the basic records from the UI. Keep the design clean and easy to understand, with a couple of simple screens and clear buttons so I can test it quickly. If there are any setup details or missing pieces, add them in a way that makes the project easy to run locally, and look up current docs online if you need to. Please make it work end to end, with sensible defaults and code that is easy to tweak later.