README: add deprecation notice and instructions

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: I079fa31665eabcb1acc681287d412485dbc2c220
diff --git a/README.md b/README.md
index 1834874..1182696 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # ibm-dbus-interfaces
-YAML descriptors of IBM specific D-Bus interfaces
+
+This repository has been deprecated and is no longer used. IBM DBus interfaces
+should go in phosphor-dbus-interfaces in the yaml/com/ibm directory.