README updates

README.md

@@ -2,7 +2,21 @@
 
 Vagabond is currently a work-in-progress. Features may be missing or subject to change.
 
-# Developing
+## What it is
+
+Vagabond — until the 0.1.0 release — is a playground for a few different approaches for integration testing of infrastructure. We're still determining how best to handle a lot of things with the goal of making  Vagabond very modular so we can re-use parts of it for other, similar projects (think Vagabond but on EC2 / Rackspace).
+
+## What it isn't
+
+Stable (yet).
+
+Finished (yet).
+
+## That Said...
+
+We'd love some of your help or input!
+
+## Developing
 
 1. Install VirtualBox.