C++ Count function map

[ebikatsudon]

Description

Created documentation for the C++ map count function. Describes the function's usage, syntax, and includes some examples in action.

Issue Solved

Closes #5477

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.

[mamtawardhani]

Hey @ebikatsudon, thank you for contributing to Codecademy Docs. The entry is nicely written! 😄

I've suggested a few changes, could you review and modify those at your earliest convenience? Thank you! 😃

[mamtawardhani]

Thank you for contributing to Codecademy Docs @ebikatsudon 😄

The entry looks good for a second round of review! 🚀