Adding dockerfiles for development and an example image

[dockerizeallthethings]

Container technology is convenient for many reasons including isolation and various degrees of immutability. Docker is a prominent container technology (and also company with which, btw, I am not affiliated, just of which I am a fan 😄).

In this PR, I add a couple of dockerfiles with which one can build docker images (I also add some documentation to the README.md):

• Dockerfile will build an image intended for development purposes. Running this file with a mounted volume at the location of the source folder (./src) will allow one to benefit from hot-reloading when developing locally (e.g. with an IDE).
• Dockerfile-prod will run Automated production build. An image of this is currently hosted on hub.docker.com here.