Change README.md

[lighting9999]

Update Summary

This PR updates the README.md with the following improvements:

• Added "How to Run" guide – includes steps to clone the repository and run scripts.
• Dependency installation notes – explained the usage of requirements.txt, clarified that some scripts only rely on the Python standard library, and that not all dependencies may be fully listed.
• Python version support update – currently supports Python 3.6+, with plans to gradually raise the minimum version to Python 3.9+.
• Preserved existing sections – kept the project overview, MIT license, and usage permissions.

These updates make the project more user-friendly and provide clearer instructions for newcomers.