Empty

[Brodes4JC]

Description

Created a new docs entry for the C++ map class' .empty() function and stored it in the new file location docs/content/cpp/concepts/maps/terms/empty/empty.md, as specified by issue #5354. Also edited the tags.md file to include a tag for C++ ('C++').

Issue Solved

Closes #5354

Type of Change

• Adding a new entry

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [x] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [x] 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.