doc: add note about status/support (or lack thereof) (#146)

diff --git a/README.md b/README.md
index 797ea92..be45ee7 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@
 If you're not familiar with Cloud Endpoints, see Google App Engine official
 documentation for [Python][1] or [Java][2].
 
+This is not an official package and comes with no guarantees or support.
+
 
 ## Install