Update README with info about Agent integration test

Signed-off-by: Zachary Auerbach <[email protected]>

README.md

@@ -87,6 +87,8 @@ BOSH uses Ruby for its tests, so you will also need to have that available.
 
 You can run all the tests by running `bin/test`.
 
+There is a stand-alone _BOSH Agent_ integration test to test config-drive using bosh-lite. This can be run locally via `integration/bin/test --provider=virtualbox`. The vagrant provider passed in can be changed to a provider of your choosing if you so desire.
+
 #### Using IntelliJ with Go and the BOSH Agent
 
 - Install [IntelliJ 13](http://www.jetbrains.com/idea/download/index.html) (we are using 13.0.1 Build 133.331)