Create a symbolic link from config -> drexel_metadata/config.
This is due to the assumption by drexel metadata that code will
be run from within that directory.
Adds code to run an app that uses the model from
https://github.com/hdr-bgnn/drexel_metadata/ to generate
images and JSON metadata. A user can upload an image and
generate the resulting output files.
Adds requirements.txt created by running `pipenv requirements`
within an environment created from drexel_metadata Pipfile.
Adds drexel_metadata as a submodule.
