Add dedicated section for using ARRCON with Python in README

[Alec8888]

Expand Modes Section with Python ARRCON Usage. This pull request contributes an addition to the "Modes" section of the README, specifically focusing on utilizing Python for ARRCON scripting and management.

Key Additions:

• Introduction to using Python libraries like subprocess for robust ARRCON control.
• Step-by-step example demonstrating saving a game server using ARRCON and Python.
• Highlighted key points for effective script development and logging integration.