[DOCS] Adds intro for Kubernetes

Author: lcawl

docs/en/getting-started/get-started-kubernetes.asciidoc

@@ -1,6 +1,10 @@
 [[get-started-kubernetes]]
 == Running the {stack} on Kubernetes
 
+You can use Docker images for {auditbeat}, {filebeat}, and {metricbeat} on 
+Kubernetes. For more information, see:
+
+* Official Elastic Docker images: https://www.docker.elastic.co/
 * {auditbeat-ref}/running-on-kubernetes.html[Running {auditbeat} on Kubernetes]
 * {filebeat-ref}/running-on-kubernetes.html[Running {filebeat} on Kubernetes]
 * {metricbeat-ref}/running-on-kubernetes.html[Running {metricbeat} on Kubernetes]