Docker: Add a README.md

docker/README.md

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+# Monkey Island Docker Image
+
+## About
+
+This directory contains the necessary artifacts for building an Infection
+Monkey Docker image.
+
+## Building a Docker image
+1. Create a clean Ubuntu 18.04 VM (not WSL).
+1. Copy the `docker/` directory to `$HOME/` in the VM.
+1. On the VM, `cd $HOME/docker`
+1. Run `sudo -v`.
+1. Execute `./build_docker.sh`. This will pull all necessary dependencies
+   and build the Docker image.
+
+NOTE: This script is intended to be run from a clean VM. You can also manually
+remove build rtifacts by running `docker/clean.sh`
+
+## Running the Docker Image
+See `docker/DOCKER_README.md` for instructions on running the docker image.