Added instructions to deploy the aar to the local Maven repo

Author: puf

README.md

@@ -219,6 +219,14 @@ We can now use that in our activity to allow sending a message:
 
 Et voila: a minimal, yet fully functional, chat app in about 30 lines of code. Not bad, right?
 
+## Installing locally
+
+We are still working on deploying FirebaseUI to Maven Central. In the meantime, you can download the
+latest release from the Releases tab on the Github repo and install it into your local Maven repository
+with:
+
+    mvn install:install-file -Dfile=/path/to/library-debug.aar -DgroupId=com.firebase -DartifactId=firebase-ui -Dversion=0.1.0 -Dpackaging=aar
+
 
 ## Deployment