Created a Dockerfile

[celaus]

Hi, we needed a Dockerfile for easier handling (specifically: background data generation), so well, here it is :)

Currently this is also what's on https://hub.docker.com/r/crate/fake-apache-log-generator/, but I suggest getting an automated build of this (your) repository going, since ours is only pushed on demand.

You should also update the maintainer in the corresponding field in the Dockerfile ;)

All the best, Claus