Add Snake game in C under games/

[KRiSHnA88H]

Description of Change

Added a Snake game implementation in C under the games/ folder.

• Fully playable game in the terminal.
• Implements movement, food spawning, growth, and game-over conditions.
• Uses simple board rendering with characters (#, O, *) for clarity.
• Includes comments and modular functions for readability and learning purposes.

References

• Inspired by the classic Snake arcade game.
• No direct duplicate found in games/.

Checklist

• Added description of change
• File name matches File name guidelines
• Added example usage (main() with play loop)
• Relevant documentation/comments added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate
• I acknowledge that all my contributions will be made under the project's license.

Notes: Added file games/csnake.c with playable Snake game implementation.