C# Strings .Concat() Entry

[ebikatsudon]

Description

Created term entry for the strings .Concat() method in C#.

Issue Solved

Closes #5564

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.

[Sriparno08]

Hey @ebikatsudon, thanks for contributing to Codecademy Docs!

This entry looks good for a second round of review.

[mamtawardhani]

Thank you for contributing to Codecademy Docs @ebikatsudon 😄

The entry looks good to be merged! 🚀

[github-actions]

👋 @ebikatsudon
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