Create a docker image from git resp

i have a github resp (GitHub - hicommonwealth/edgeware-node: Substrate node implementing Edgeware). it has a docker file. I want to create a image from this but dont know where to start. any help is appreciated.

Download the repo and in the directory where Dockerfile is:
docker build -t edgeware .

else have you checked hub.docker.com to see if someone allready did it?
Docker Hub