add swap file to cpp terms

[frowningfrog]

Description

Added swap file for c++ terms. This is my first issue taken for the codecademy course

Issue Solved

Closes #7633

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]

Hey @frowningfrog, please also add an ## Example section along with its output above the ##Codebyte Example section. Let me know once it is done, thank you!

[frowningfrog]

@mamtawardhani thank you for the feedback!
I've updated to include the changes 🐸