Created term entry for .assign() method for C++ strings

[em07-adoz]

Description

I created a term entry for the C++ strings .assign() method. My motivation for doing this was a a part of the my project for the Write Tech Bootcamp that I took to learn Technical Writing .

Issue Solved

Closes #7094 [Term Entry] C++ Strings: assign()

Type of Change

• Adding a new entry

• Adding a new entry
• Editing an existing entry (fixing a typo, bug, issues, etc)
• Updating the documentation

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.

[mamtawardhani]

Hey @em07-adoz, looks like the entry is jumbled up. The syntax section is apperaing in all the examples. Could you structure it please, then we can continue reviewing the entry. Can you also please fix the path of the file?

Thank you! 😄

[mamtawardhani]

Suggested change

	Title: '.assign()'
	Description: 'Replaces the contents of a C++ string with new characters or strings.'
	Subjects:
	- 'Code Foundations'
	- 'Computer Science'
	Tags:
	- 'Characters'
	- 'Assignment'
	- 'Methods'
	- 'Strings'
	CatalogContent:
	- 'learn-c++'
	- 'paths/computer-science'
	Title: '.assign()'
	Description: 'Assigns new content to a string, replacing its current contents with specified characters, substrings, or values.'
	Subjects:
	- 'Code Foundations'
	- 'Computer Science'
	Tags:
	- 'Assignment'
	- 'Characters'
	- 'Methods'
	- 'Strings'
	CatalogContent:
	- 'learn-c-plus-plus'
	- 'paths/computer-science'

[mamtawardhani]

Suggested change

	**`.assign()`** is a method used to **replace the contents of a C++ string** with new data. Unlike `.append()`, which adds to the end of a string, `.assign()` **overwrites** the current content.
	This method is useful when:
	- You want to fully replace a string with a different one.
	- You need to copy a **substring**, specific **number of characters**, or even **characters from an iterator range**.
	The **`.assign()`** method replaces the contents of a string with new characters, allowing precise control over what the string holds. It is commonly used in scenarios such as loops, input parsing, or reusing string variables to optimize memory and performance.

[mamtawardhani]

Please showcase the Syntax of this term along with its parameter description and return value.