docker compose yml

Maybe would be nice to have an example docker-compose yml  in the repo 
Mine looks something like - 

  esp-updater:
    image: kstobbe/esp-update-server:latest
    container_name: esp-updater
    ports:
      - 5000:5000
    volumes:
      - /opt/esp-updater:/esp-update-server/bin


[ edit volume path as appropriate ] 