Implement Difficulty Levels

The code currently has placeholders for setting the bounds and max attempts for each difficulty level (Easy, Medium, Hard). Implement the correct values for these difficulty levels:

Easy: Range 1-10, 5 attempts.
Medium: Range 1-50, 7 attempts.
Hard: Range 1-100, 10 attempts.

Acceptance Criteria:

Update the switch statement to set lowerBound, upperBound, and maxAttempts for each case.

Find the switch statement for difficulty levels in the codebase, likely in a main game logic file. Update the 'Easy', 'Medium', and 'Hard' cases to set lowerBound, upperBound, and maxAttempts as specified. Compile and run the program to test each difficulty level.

索引モデルが issue の本文から書いたものです。