added first line of PR https://github.com/owncloud/android/pull/219

fixing issue pointed out by dper:
https://github.com/owncloud/android/pull/219#issuecomment-26715595

README.md

@@ -1,5 +1,7 @@
 This is the android client for [owncloud][0].
 
+It only allows file syncronization. Other OwnCloud features may be added in the future, but they are not a priority right now.
+
 Make sure you read [SETUP.md][1] when you start working on this project.
 
 [0]: https://github.com/owncloud/core