Added a dev container for the backend
see makefile, run make docker build -t mc-backend-dev -f $(PWD)/dev.DockerFile . then docker run -it -p 8000:8000 -v $(PWD)/app:/app/ mc-backend-dev
see makefile, run make docker build -t mc-backend-dev -f $(PWD)/dev.DockerFile . then docker run -it -p 8000:8000 -v $(PWD)/app:/app/ mc-backend-dev