Enable coordination for cinder service

Supported backend: mysql

PROD-36497

Change-Id: If2965382834f517a42de10dbf773e90f2c9ee3b0
diff --git a/README.rst b/README.rst
index ac0210e..c0330db 100644
--- a/README.rst
+++ b/README.rst
@@ -1054,6 +1054,19 @@
       volume_name_template: 'custom-volume-name-%s'
 
 
+Enable coordination for cinder service:
+=======================================
+In order to enable coordination two options need to be set: enabled and backend 
+
+.. code-block:: yaml
+
+    cinder:
+      controller:
+        coordination:
+          enabled: true
+          backend: mysql
+
+
 Upgrades
 ========