musicbox

Creates 3 docker images for ECS:

• rockapp - return random rock artist (text), listen for port 9003 or env variable PORT
• operaapp - return random opera artist, listen for port 9002 or env variable PORT
• music box - listen for port 9000 or env variable PORT, using env variables ROCK_HOST and OPERA_HOST (may be IP:port or DNS:port) to call rockapp (route /rock) or operaapp (route /opera) and return their returned values in json format. Route /ping will return message "ping successful" in case of success.