Improved The Backend

[DeveloperWilliams]

To improve this code, I focused on several aspects:

1. Error Handling: Improve error handling to ensure the application doesn't crash and provides meaningful messages.
2. Security: Enhance security measures, especially around JWT handling and password management.
3. Code Structure: Refactor the code for better readability and maintainability.
4. Environment Variables: Use environment variables for sensitive data such as database connection strings and secret keys.
5. Async/Await: Ensure all asynchronous operations are properly handled with async/await.
6. Validation: Add input validation to prevent invalid data from being processed.
7. Added README File to assist other developers navigate the project easily.