Add docker compose file at the root of the project

[zergov]

Fixes: #2

I updated the Dockerfile of the backend service, and I added a docker compose file at the root of the project so that both services can be started at the same time with a simple command. I also updated the README at the root of the project to provide instructions.

Update Backend Dockerfile

Reorder Dockerfile instructions to make build time faster when only the source changes.

Add docker compose file at the root of the project

Developers can just run this command at the root of the project to launch both the frontend and backend services:

$ docker compose up

[syw1-art]

docker compose up command worked so I think it should be good

[zergov]

@syw1-art thanks for testing it out :P