Add a Dockerfile to the repo

[OrangeCrush]

I am suggesting that we add a Dockerfile to build and run the FizzBuzz application in a linux container.

The container needs to be extensible and modular such that other enterprise applications that are also packaged as a container would be able to leverage FizzBuzz.

We could also have a separate container build to automate the unit testing.

Curious on others' thoughts on how this impacts the modern enterprise's FizzBuzz business cases.