Update README.md

Author: Cristian

README.md

@@ -1,4 +1,9 @@
 java-cloudfiles
 ===============
 
-Java library to interact with Swift REST API.
+This library is a branch of [Rackspace Java CloudFiles project](https://github.com/rackerlabs/java-cloudfiles]). It is used in the desktop client to communicate with Swift.
+
+In order to build:
+
+1)  Download the repository (which if you're doing this, you already have)
+2)  type "ant compile" (or "ant package" if you'd like the full package)