feat: add Snake and Ladders game (single player)

[KarthikeyaPila]

Description of Change

Added a single-player console-based Snake and Ladders game written in C.
The game uses a static board with predefined snakes and ladders, and the player rolls a dice until they reach exactly 100.

References

N/A – This is a new addition.

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass — Not applicable for interactive console game
• Relevant documentation/comments is changed or 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: This is my first open source contribution. The program is beginner-friendly and demonstrates the use of arrays, random numbers, and conditionals.

[KarthikeyaPila]

Hi maintainers 👋,
@JianLoong @satbekmyrza @vbrazo

This is a gentle reminder to kindly take a look at my PR whenever you have some time. I'm excited about contributing to this amazing repository, and this is my first open source contribution. I’ve followed the contributing guidelines and would really appreciate any feedback or suggestions you might have.

Thank you! 😊

— Karthikeya