docker compose

• using version 3 of docker compose
• How many services we will run, here we run 1 django
• name the service as 'app'
• build context is location from which docker-compose runs
• map port from docker to local-host
• volume allows us to get update from local to docker container in real time
• map app directory to app directory in docker image
• command to run application

run using docker-compose build