Initialize a simple NodeJS backend

Initialize a simple NodeJS backend to response with its config on a /config route

acceptance

• anyone should be able to clone a repo, perform an installation steps and run a web-server using docker-compose
• current configuration should be visible under a /config route

steps:

• create a repo
• configure nodejs
• configure env variables injection
• configure a docker-compose.yml
• implement an ExpressJS /config route handler