Add Dockerfile

[botzill]

Would be great to have a Dockerfile so that we can easily deploy on server.

Thx!

[n1t0]

This has been done with #8 (Thanks to https://github.com/zallison)

A public image is available at https://hub.docker.com/r/huggingface/mongoku
And so you can run it with

docker run -d --name mongoku -p 3100:3100 huggingface/mongoku