Implemented score and MaxScore logic.

[shuklamaneesh23]

tackled issue #1

Changes Implemented:

• Added a scoring mechanism to track points earned when the snake consumes food.
• Implemented local storage to maintain the highest score achieved even after a refresh.

Details:

• Added logic to track and display the current score during gameplay.
• Implemented local storage to persistently store and update the highest score achieved.
• Modified the game engine to update the highest score in local storage when a new high score is achieved.

Testing:

• Conducted thorough testing to ensure the scoring mechanism accurately tracks points earned.
• Tested the persistence of the highest score in local storage across refreshes and browser sessions.