[Feature] Implement Experience Bar and Progression System

[AntGa]

Problem

Currently, the game only offers leaderboard rankings as a form of progression. It would be more engaging for players to have something additional to work towards. Implementing an experience bar and progression system would give players a sense of achievement beyond the leaderboard.

Objectives

• Design and implement an experience (XP) system that rewards players for their performance.
• Add an experience bar UI element that tracks progress toward the next level.
• Define milestones or levels based on XP earned, with potential rewards or recognition.
• Ensure the XP system integrates smoothly with existing gameplay mechanics.

Acceptance Criteria

• Experience bar and progression system are implemented and visible in the UI.
• Players earn XP based on performance (e.g., words typed, accuracy, etc.).
• XP milestones and progression are clearly defined and functional.
• PR reviewed and tested for balance and integration with the existing game flow.
• Documentation updated to explain the XP system and how it works.