README.md: create file

Add deprecation notice and instructions

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: I11ecec1a8e2e9854745f2a4b349edf898b4cf752
diff --git a/README.md b/README.md
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+# openpower-dbus-interfaces
+
+This repository has been deprecated and is no longer used. OpenPOWER DBus
+interfaces should go in phosphor-dbus-interfaces in the yaml/org/openpower
+directory.