add description added

[linuxehr]

Description

This pull request adds a new entry for the .add() method under Java's Queue concept.

• Created the file: content/java/concepts/queue/terms/add/add.md
• The new entry includes:
  • A description of the .add() method
  • Syntax section with explanation of parameters, return type, and exceptions
  • A working example with code and output
  • Required metadata for catalog indexing (Title, Description, Subjects, Tags, CatalogContent)

The .add() method is an essential part of Java's Queue interface. This addition helps clarify how it differs from .offer(), particularly in how each handles capacity restrictions. It supports learners in understanding proper queue insertion techniques.

Issue Solved

Closes #7362

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.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Hey @linuxehr please complete the entry with:

• Syntax (defining parameters and return value)
• Examples showcasing the entry

Let me know once done.