[Term Entry] Python pillow .convert()

[codecademy-docs]

Reason/inspiration (optional)

We would like a new term entry on the '.convert()' method for the Pillow library in Python. The entry should go in a new file under docs/content/pillow/concepts/image/terms/convert/convert.md

The entry should include the following:

• A description of the function
• A ## Syntax section that includes the syntax of the function and its details
• An ## Example section that includes a python codeblock and shell that shows the example output.

Please refer to the concept 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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