[Feature]: Show Game Over Dialog

[ashutosh-7503]

So, what is it about?

• File: lib/homepage.dart
• Function: _showDialog
• Hint: Use the showDialog function to display a dialog when the game ends. Include a restart option.

Code of Conduct

• I agree to follow this project's Code of Conduct

[shaurya-8055]

Hi, I'd like to take this issue. It looks like it hasn't been solved yet, and I'm available to work on it. Please assign it to me