Add possibility to manage file permissions of config files

Fixes-bug: PROD-36558
Change-Id: Ie65b7749b0cbeb1df660192f7f82822eb1014ff1
diff --git a/README.rst b/README.rst
index 4bae229..e9d4666 100644
--- a/README.rst
+++ b/README.rst
@@ -300,6 +300,38 @@
           # Add key without value to remove line from policy.json
           get_quotas:
 
+
+Change files/directories permissions for designate service:
+=======================================
+In order to change file permissions the following should be set:
+
+'files' - block to set permissions for files.
+- full path to file
+- user ( default value is 'root' ) this parameter is optional.
+- group ( default value is 'designate' ) this parameter is optional
+- mode ( default value is '0640' ) this parameter is optional
+
+'directories' - block to set permissions for directories.
+- full path to directory
+- user ( default value is 'root' ) this parameter is optional
+- group ( default value is 'designate' ) this parameter is optional
+- mode ( default value is '0750' ) this parameter is optional
+
+.. code-block:: yaml
+
+    designate:
+      files:
+        /etc/designate/designate.conf:
+          user: 'root'
+          group: 'designate'
+          mode: '0750'
+      directories:
+        /etc/designate:
+          user: 'root'
+          group: 'designate'
+          mode: '0750'
+
+
 Upgrades
 ========