**Acceptance Criteria**
[x] On either https://commons.wikimedia.beta.wmflabs.org/wiki/Special:ImportFile or https://test.wikimedia.beta.wmflabs.org/wiki/Special:ImportFile (which both have FileImporter installed, for more details see [[ https://docs.google.com/document/d/1VK1DSmavMZc0s2EAb03FW5C6FA8Fr0_AJsHPBdz1-aQ/edit#heading=h.2ca6a6lly86i | here ]]) add a config page that can be manipulated for testing purposes
**Demo**
The beta-commons configuration sandbox can be demonstrated here: https://commons.wikimedia.beta.wmflabs.org/wiki/Special:ImportFile?clientUrl=https://en.wikipedia.beta.wmflabs.org/wiki/File:Lovely_automatic_translation_fail.png
That file is using a "TestExtra" template parameter which is mapped by https://commons.wikimedia.beta.wmflabs.org/wiki/Extension:FileImporter/Data/en.wikipedia
(Please don't actually import the file, it's tedious to prepare a new one...)