Update README for installation [ci skip]

README.md

@@ -8,6 +8,39 @@ a secondary system.
 
 ## Installation
 
+To use the install script you need to have the following commands available on your
+system `curl wget unzip sudo cc` and possibly other build essentials for C. For Ubuntu
+and Docker images of Ubuntu you can install these prerequisites with:
+
+```bash
+apt-get update && apt-get install curl wget unzip sudo build-essential
+```
+
+_NOTE: if you are not root you may need to precede `apt-get` with `sudo`_
+
+
+The `install.sh` script will check for Rust and aescrypt and proceed to install them
+if they are missing _(it will ask you if you want to install Rust)_.
+
+First download the installation script locally.
+
+```bash
+curl https://raw.githubusercontent.com/danielpclark/abrute/master/install.sh > install.sh
+```
+
+Then verify that the contents of the installation script is safe to use (a no brainer).
+
+Then run
+
+```bash
+bash install.sh
+```
+
+This install script will use sudo to copy the binary directly to `/usr/bin` and make the
+command `abrute` available to you everywhere.
+
+### Manual Installation
+
 First you need to have aescrypt installed.
 
 ```bash