build: Add README with instructions for appimage builder

deployment_scripts/appimage/README.md

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+# Monkey Island AppImage
+
+## About
+
+This directory contains the necessary artifacts for building a prototype
+monkey_island AppImage using appimage-builder.
+
+## Building an AppImage
+
+1. Create a clean VM or LXC (not docker!) based on Ubuntu 18.04.
+1. Update the OS with `sudo apt update && sudo apt upgrade`
+1. Copy the `deployment_scripts/appimage` directory to `$HOME/` in the VM.
+1. Run `sudo -v`.
+1. On the VM, `cd $HOME/appimage`
+1. Execute `./build_appimage.sh`. This will pull all necessary dependencies
+   and build the AppImage.
+
+NOTE: This script is intended to be run from a clean VM. You can also manually
+remove build artifacts by removing the following files and directories.
+
+- $HOME/.monkey_island (optional)
+- $HOME/monkey-appdir
+- $HOME/git/monkey
+- $HOME/appimage/appimage-builder-cache
+- $HOME/appimage/"Monkey\ Island-\*-x86-64.Appimage"
+
+After removing the above files and directories, you can again execute `bash
+build_appimage.sh`.
+
+## Running the AppImage
+
+The build script will produce an AppImage executible named something like
+`Monkey Island-VERSION-x86-64.AppImage`. Simply execute this file and you're
+off to the races.
+
+A new directory, `$HOME/.monkey_island` will be created to store runtime
+artifacts.