Add sound effects and audio management system

[rohit12907]

Pull Request

Description

Implemented a complete audio management system for the Pac-Man game.

Changes Made

• Added gameplay background music.
• Added food collection sound effect.
• Added ghost collision sound effect.
• Added game over sound effect.
• Added mute/unmute functionality using the M key.
• Added centralized SoundManager class for audio handling.

Additional Enhancements

• Added a Pac-Man themed welcome screen with Start Game functionality.
• Added game restart functionality after game over.
• Added Game Over menu with Restart, Back to Menu, and Exit options.
• Added sound status indicator (Sound ON / Muted).

Fixes #1

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Type of Change

• Bug fix
• New feature
• UI improvement
• Documentation update
• Performance improvement

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Checklist

• My code follows the project style
• I tested my changes
• I have updated documentation if needed
• My changes generate no new warnings

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Screenshots (if applicable)

Welcome Screen

Gameplay Screen

Game Over Menu

[rohit12907]

Closing this PR and creating a cleaner PR with only the required files.