Node.js Server

User story

As a developer, I want to set up a simple Node.js server to handle the chat application's backend functionality. I plan to follow this tutorial. The server should integrate with both the frontend and backend using socket.io and express.js. I also need to implement functionality to keep track of connected users in an array and store messages in an array of objects.

Acceptance criteria

• The Node.js server is set up according to the provided tutorial.
• The server is integrated with the frontend and backend using socket.io and express.js.
• An array is used to track connected users.
• Another array of objects is used to store chat messages.