Update barbican policy management

PROD-34318

Change-Id: I1efb619fd085458b55fbaeba7d1b43e76ca9e37c
diff --git a/README.rst b/README.rst
index 29d1578..04ccd70 100644
--- a/README.rst
+++ b/README.rst
@@ -238,6 +238,19 @@
           cacert_file: /etc/openstack/mysql-ca.pem
 
 
+Change default service policy configuration:
+--------------------------------------------
+
+.. code-block:: yaml
+
+    barbican:
+      server:
+        policy:
+          creator: 'role:creator'
+          audit: 'role:audit'
+          # Add key without value to remove line from policy.json
+          quotas:get:
+
 Configuring plugins
 -------------------