Add documentation for bucket sort

[Mahi-korrapati]

This pull request adds a complete and clear documentation file for the Bucket Sort algorithm. The documentation explains the concept, steps, complexity, and provides a Rust code example aligned with the existing implementation in the repository.

[Mahi-korrapati]

Hello!
I have added detailed documentation for the Bucket Sort algorithm.
Kindly review this PR and let me know if any changes are required.
Thank you for your time.

[alexfertel]

😅 you removed the whole file...