Add possibility to manage volume_name_template

Fixes-bug: PROD-35997
Change-Id: Ifc023a1dd490e794fa73e59be246e8bdd03b8b7c
diff --git a/README.rst b/README.rst
index 6e4739b..ac0210e 100644
--- a/README.rst
+++ b/README.rst
@@ -1045,6 +1045,15 @@
           volume:create:
 
 
+Change default volume name template:
+====================================
+
+.. code-block:: yaml
+
+    cinder:
+      volume_name_template: 'custom-volume-name-%s'
+
+
 Upgrades
 ========