[Term Entry] Javascript string method : codepointat

[SaraChaygani]

Description

Created the entry for the term of the codePointAt() method, which retrieves the Unicode code point of a character at a given index position in a string.
I am currently finishing off my Git/Github course on CodeAcademy, and this was a project to practice collaborating with Github Community and most importantly contributing to the CodeAcademy Docs repository.
Working on this project gave me the chance to reinforce what I learned and apply it in a real world interactive project.

Issue Solved

Closes #6958

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.

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