Adding new Pyqt6 appilication Resource Monitor

[lanjithkumar15]

This pull request adds a new PyQt6 application called Resource Monitor. It demonstrates real-time monitoring of system resources (CPU, memory, and network speed) using PyQt6, pyqtgraph, and QThread for background processing. Key features include:

Real-time CPU usage with individual plots per core.
Memory and swap usage monitoring with dynamic legends.
Network upload and download speed tracking.

To test the application, simply run the main file after installing the required dependencies. I’ve also ensured that the new code adheres to the project’s coding style. Please review my contribution and let me know if there are any further changes needed.