Commit secure_download compose and deploy script

Created by: ri-pandey

The secure_download runs within Docker containers, but the compose file is missing from the repo. This file can be added to the repo, so developers can look at the config before bothering Operations.

The secure_download's deployment script (deploy.sh) should also be committed to the repo. @rperigo instead of renaming the compose file, you could keep the docker-compose-prod name and keep it within the /secure_download directory.