Unordered sets bucket

[georgeXaguilar]

Added new topic .bucket() and corresponding markdown file. Wrote these to contribute to Codecademy Docs repository as well as a way to get practical experience in using git, writing markdown files, and overall contribute to the coding community on my way to becoming a developer.

Closes #8051

Type of Change

• Adding a new entry

Checklist

• [x ] All writings are my own.
• [ x] My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• [x ] I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• [x ] I have confirmed my changes are not being pushed from my forked main branch.
• [x ] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [x ] I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Looks good for a second review! 🚀