Added Bucket Sort

[Sanchita1304]

Change Summary

Added Bucket Sort

Checklist

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General

• [ ] This Pull Request is all my own work. (You'll be blacklisted if you are caught for plagiarism.)
• [ ] I've read CONTRIBUTING.md
• [ ] I've applied LaTex for all variables, formulas and time / space complexity instead of using backticks
• [ ] I've started the app locally and verified all the content and all links (if applicable) are accessible correctly
• [ ] I've included Complexity Analysis (Time Complexity & Space Complexity).
• [ ] I've written my explanation well and it is easy to understand for beginners

Tutorial

• [ ] I've read and followed the Tutorial Template
• [ ] I've explained my topic well with 2 - 3 LC problems and no external problems are used.
• [ ] I've provided the full working solutions to the problems used in this tutorial.
• [ ] I've provided suggested problems at the end with the given format. See here as an example. If the target solution is not available, leave solutionLink blank.
• [ ] I've given credits / references if I use external resources. (For an image, give credit under it. Otherwise, add a new section called References at the end (after Suggested Problems).)

Solutions

• [ ] I've read and followed the Solution Template
• [ ] I've formatted my code well with K&R Coding style
• [ ] I've confirmed that comments are put above each line rather than writing on the same line.
• [ ] I've included a meaningful approach name for my solution. e.g. ## Approach 1: Two Pointers.