Install Docker and run hello-world

1. Create a folder cmd, that contains two files: Dockerfile and index.js.
2. To index.js, add printing the first command-line parameter in format "Hello ${param}!".
3. Write a Dockerfile that runs that file (as an entrypoint).
4. Add a command-line parameter to the docker command execution and make sure it prints "Hello ${param}!", e.g. "Hello world!".

1. Create a folder cmd, that contains three files: Dockerfile, package.json and server.js.
2. Add express or koa to package.json.
3. Install npm dependencies
4. Make server.js answer to endpoint / and return "Hello world".
5. Add node, package.json and server.js to Dockerfile
6. Run server using docker.

Add docker-compose.yml to exercise 2 and run the server through that.