Dockerize Needl

[eth0izzle]

I'm not familiar with Docker but this looks like this would be a good starting point: https://runnable.com/docker/python/dockerize-your-python-application

[MrLokans]

I am ready to create a PR with simple docker integration but you will need to create an account on dockerhub and push the image built there in order for others to be able to download it and run locally.

[MrLokans]

@eth0izzle I've added the Docker support in #7, can you please approve/decline it? It will require extra steps from you (described in PR), if you need any help - I'm ready to provide it, thanks.