Add possibility to manage file permissions of config files

Fixes-bug: PROD-36553
Change-Id: I4a8314449ecf6cb56e32fa04236899f1a914e164
diff --git a/README.rst b/README.rst
index a4f905d..bd71fd6 100644
--- a/README.rst
+++ b/README.rst
@@ -432,6 +432,38 @@
             host: 0.0.0.0
             port: 8125
 
+
+Change files/directories permissions for gnocchi 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 'gnocchi' ) 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 'gnocchi' ) this parameter is optional
+- mode ( default value is '0750' ) this parameter is optional
+
+.. code-block:: yaml
+
+    gnocchi:
+      files:
+        /etc/gnocchi/gnocchi.conf:
+          user: 'root'
+          group: 'gnocchi'
+          mode: '0750'
+      directories:
+        /etc/gnocchi:
+          user: 'root'
+          group: 'gnocchi'
+          mode: '0750'
+
+
 More Information
 ================