shabana-15/mern ? reverse-engineered prompt

Build me a simple MERN style app with a backend and a frontend that work together cleanly.

I want a basic web app where a user can add, view, edit, and delete items in a list, with the data saved on the server and shown on the page right away. Make the frontend feel modern and easy to use, with a simple form, a list view, and clear buttons for actions. The backend should expose the needed routes, connect to a database, and handle errors in a friendly way. Please set up everything so it runs easily from the two existing folders, and make sure the app works from end to end.

If you need current docs or best practices for anything, look them up online first. Also add a short README so I know how to start both parts locally.