Add white border on the edge of the screen

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Description

This PR adds a white border on the edge of the screen in the command-line snake game. The border enhances the visual appeal of the game and provides a clear boundary for the game area.

Summary

• Modified cli_snake_game/game.py to draw four white rectangles on the edges of the game screen using Pygame's pygame.draw.rect function.
• The border is drawn with a fixed width of 10 pixels and is included in every frame within the game loop.

Fixes #5.

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Apply Sweep Rules to your PR?

• [x] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.