Create new entry for C++

[anastasiia-volova]

Description

Create new entry on the Hierarchical Inheritance term under C++.

Issue Solved

Issue 6020 - [Term Entry] C++ Inheritance: Hierarchical Inheritance.

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.