Add ability to hide CI comments

Related-PROD: https://mirantis.jira.com/browse/PROD-20795

Change-Id: I2be13500ef0f559187190e72fa3ff704ae6e27b6
diff --git a/README.rst b/README.rst
index 51410e2..9494238 100644
--- a/README.rst
+++ b/README.rst
@@ -293,6 +293,15 @@
 
 For creating ssh keys use openssh state
 
+Gerrit hide CI
+
+.. code-block:: yaml
+
+    gerrit:
+      server:
+        hideci:
+          ci_user_name: ci_user
+
 Read more
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