Add test file

[prestonp]

💃

[MHBauer]

Please sign your commits following these rules:
https://github.com/docker/docker/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "moxiegirl-patch-README" git@github.com:docker/docker.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f
Ammending updates the existing PR. You DO NOT need to open a new one.