[Term Entry] C++ Unordered-sets: size() Contribution

[KristofferBarnerKleis]

Description

• Added the Unordered-sets: size() term for C++

Issue Solved

• Closes Issue [Term Entry] C++ Unordered-sets: size() #8044

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]

The PR looks good for a second review! 🚀

[KristofferBarnerKleis]

@mamtawardhani
Looks good!
Thanks for the help

[Sriparno08]

Looks good, @KristofferBarnerKleis!

[github-actions]

👋 @KristofferBarnerKleis
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