Add Dockerfile, docker-compose.yml and some info

[theodorosploumis]

I think it would be nice to have these files on the repo too! Thanks for the example.

[retrohacker]

Hey @theodorosploumis!

These files look great, thank you for opening this PR!

Part of me says that a big portion of the tutorial is actually creating those files and getting familiar with the syntax...

The other part says that people need a reference solution for when their file isn't working and they don't know why...

Perhaps we can get the best of both worlds? What are your thoughts on creating a directory called solution and moving these files there?

[theodorosploumis]

Or maybe create a separated branch with the solutions included.

[retrohacker]

Hmm... Would a branch be as easy to find as a folder?

[retrohacker]

The branch would probably be cleaner but might be harder to find.

If we included a solutions directory, we would probably need to include a .dockerignore file as well.

[theodorosploumis]

Most of the examples of that type (git repos) have separated branches and a declaration on the readme about using other branches. Users are to lean docker they know how to use Github. Also, if we use another folder we need to copy again all the files inside the folder.

[theodorosploumis]

Also, if there is no complete setup users will not be able to propose changes, improvements (like mine) and reuse/extend the code to their needs.

[retrohacker]

This landed in the solutions branch of this repo. Instructions were added to the readme directing users to that branch.

Thanks for the contribution!