docs: Added Quickstart info

In order to help bootstrap individuals in using the project a
simple quickstart file has been added explaining how to both
download buildroot and reference the external repo in the
correct way.

Author: brianredbeard

README.md

@@ -7,3 +7,30 @@ removal of man pages, shared files, and many pieces not germaine to running
 on an embedded platform.  At CoreOS we use Buildroot for the generation of 
 [minimal containers](https://github.com/brianredbeard/minimal_containers) for
 use with [rkt](https://github.com/coreos/rkt) and Docker.
+
+## Quick Start
+
+To get started using these pieces one should do the following:
+
+Step 1 - Clone [buildroot](https://github.com/buildroot/buildroot):
+
+```
+$ git clone [email protected]:buildroot/buildroot.git
+```
+
+Step 2 - Clone CoreOS_buildroot (note: this should not be in the buildroot
+directory):
+
+```
+$ git clone [email protected]:brianredbeard/buildroot.git
+```
+
+Step 3 - Reference the `coreos_buildroot` directory from `buildroot`:
+
+```
+$ cd buildroot
+$ make BR2_EXTERNAL=../coreos_buildroot menuconfig
+```
+This connects the two repos together and exposes all of the coreos_buildroot
+options through the menu option "User-provided options  --->"
+