[Term Entry] JavaScript DOM Manipulation: .appendChild() #6236

[krgyaan]

Description

Added a new term entry for .appendChild() in the JavaScript DOM Manipulation concept. Created the file content/javascript/concepts/dom-manipulation/terms/appendchild/appendchild.md along with the terms/appendchild/ subdirectories, as they did not exist. The entry includes an introduction, syntax, example, and a Codebyte example, following the Codecademy Docs term entry template and style guide. This contribution enhances the DOM manipulation documentation by explaining a key method for dynamically adding nodes to the DOM.

Issue Solved

Closes #6236

Type of Change

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

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.

[Sriparno08]

Hey @krgyaan, please sign the CLA in the above message, so that we can merge the PR.

[krgyaan]

@Sriparno08 signed the CLA.

[Sriparno08]

Looks good for a second round of review, @krgyaan!

[mamtawardhani]

Thank you for contributing to Codecademy Docs @krgyaan 😄
The entry looks good to be merged! 🚀

[github-actions]

👋 @krgyaan
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