[Term Entry] C# Math-functions: IEEERemainder()

[ylevental]

Description

New term entry for C# Math.IEEERemainder() method under math-functions concept.

File created: content/c-sharp/concepts/math-functions/terms/ieeeremainder/ieeeremainder.md

Content includes:

• Description explaining IEEE 754 standard remainder vs modulo operator
• Syntax with parameters (x, y as doubles) and return value semantics
• Special case handling (NaN, infinity, banker's rounding for ties)
• Example demonstrating difference: Math.IEEERemainder(5, 3) returns -1 while 5 % 3 returns 2
• Codebyte with multiple test cases showing the behavioral differences

Issue Solved

Closes #7987

Type of Change

• 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.