show_win():
The show_win() function is responsible for displaying a "YOU WIN" message on the game screen when the player wins the game by achieving a certain score (defined by the WIN_SCORE constant).
It uses the game_over_font to create a large, green "YOU WIN" text.
The text is positioned on the screen at coordinates (250, 250) to center it.
This function is called within the game loop when the player reaches the required score.
The "YOU WIN" message provides a clear visual indicator to the player that they have successfully completed the game by reaching the winning score.