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

[codecademy-docs]

Reason/inspiration (optional)

We would like a new entry on the .appendChild() term under the DOM concept in JavaScript. The entry should go in a new file under content/javascript/concepts/dom-manipulation/terms/appendchild/appendchild.md.

The entry should include:

• An introduction to the concept
• A Syntax section that provides the syntax for the concept (if applicable)
• An Example section that provides an example demonstrating the concept in use (if applicable)

Please refer to the term entry template, content standards, and markdown style guide when working on the PR for this issue.

Entry Type (select all that apply)

New Term for Existing Concept Entry

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