Add possibility to manage file permissions of config files

Fixes-bug: PROD-36559
Change-Id: I425465b2dbcb51a9d70697596ef10f8e4825dd7e
diff --git a/README.rst b/README.rst
index 3db3493..07dd64a 100644
--- a/README.rst
+++ b/README.rst
@@ -539,6 +539,37 @@
           modify_member:
 
 
+Change files/directories permissions for glance 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 'glance' ) 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 'glance' ) this parameter is optional
+- mode ( default value is '0750' ) this parameter is optional
+
+.. code-block:: yaml
+
+    glance:
+      files:
+        /etc/glance/glance.conf:
+          user: 'root'
+          group: 'glance'
+          mode: '0750'
+      directories:
+        /etc/glance:
+          user: 'root'
+          group: 'glance'
+          mode: '0750'
+
+
 Usage
 =====