[Term Entry] C++ Sets: empty()

[raymondcastro-hub]

Description

This PR adds a new term entry for the empty() method in C++, located in content/cpp/concepts/sets/terms/empty/empty.md. The entry explains how the empty() method is used in the context of std::set, including:

• A clear description of empty() in C++
• A Syntax section covering the method’s syntax, parameters, and return values
• An Example section demonstrating empty() in action
• A Codebyte section with compilable code showing a possible application of empty()

Issue Solved

Closes #7173

Type of Change

• Adding a new entry

Checklist

• All writings are my own.
• 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.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• 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! 🚀

[raymondcastro-hub]

Good morning, @mamtawardhani. Thank you for reviewing my term entry and PR! Thanks to your recent edits, the empty.md file is higher quality than before. Feel free to let me know if you need anything else from me!