Added background music, picture, and some changes

[PaullyMac]

This pull request introduces significant enhancements to the HexaHunt project, including a new artifact hint system, updates to the AI logic, and improvements to documentation. The changes enhance gameplay mechanics, improve user experience, and provide better technical clarity for contributors.

Gameplay Enhancements:

• Artifact Hint System: Introduced visual hints for artifact usage, including a draw_artifact_hint() function and a timer system to manage hint display duration. Hints are now integrated into the main drawing pipeline.
• Improved AI Logic: Enhanced the Minimax algorithm by adding move ordering heuristics, transposition tables, and artifact-related messages for better gameplay dynamics.

Bug Fixes:

• Artifact Hint Display Issues: Resolved problems preventing artifact hints from appearing, including variable scope issues, incorrect hint assignments, and drawing order errors.
• Game Over Text Positioning: Fixed end-game message positioning with proper centering, text shadow effects, and dynamic coloring based on the game's outcome.

Documentation Updates:

• README.md: Added detailed project overview, features, algorithms, and instructions for running HexaHunt locally. Improved clarity and accessibility for new contributors.