Add CORS configuration to our Express.js server to allow it to accept requests from 'http://localhost:5173'.

[mayura-andrew]

Purpose

The purpose of this PR is to fix #88

Goals

This PR introduces CORS configuration to our Express.js server, allowing it to accept requests from different origins, perform HTTP methods, and allow session cookies to pass through.

Approach

I've added CORS middleware to our Express.js server and configured it to accept requests from 'http://localhost:5173', allow 'GET, HEAD, PUT, PATCH, DELETE' methods, and set 'credentials' to true to allow session cookies to pass through.

Screenshots

N/A

Checklist

• [x] This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• [x] I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation

Related PRs

N/A

Test environment

Tested on Node.js v20.10.0

Learning

N/A