Add README

With details about the status of support for this app

Bug: 280583057
Change-Id: I639c9595b4b5696de735ab0339ec5d40b1cd90a1
diff --git a/README b/README
new file mode 100644
index 0000000..15142ba
--- /dev/null
+++ b/README
@@ -0,0 +1,2 @@
+This app is not actively supported and the source is only available as a reference. This project will be removed from the source manifest sometime in the future.
+