created markdown file for cpp vector front

[evanshi0811]

Description

Created a markdown file for the front method for C++ vectors.

Issue Solved

Closes #4983

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.

[cigar-galaxy82]

Hi @evanshi0811 thank you for contributing to Codecademy docs, I have suggested a few changes please modify them.

[evanshi0811]

Is there anything else I need to change before moving onto the second review?

[cigar-galaxy82]

@evanshi0811 everything looks good, the entry is ready for second review

[github-actions[bot]]

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