added extraVolumes and extraVolumeMounts to kibana and updating helm/…

…README.me from values.yaml

apigateway/helm/README.md

@@ -318,6 +318,8 @@ Sub-folder `examples` contains some *values* examples for more use-cases. To use
 | kibana.extraContainers | list | `[]` | The definition of extra containers for kibana. |
 | kibana.extraInitContainers | list | `[]` | The definition of extra initContainers for kibana. |
 | kibana.extraLabels | object | `{}` | Additional labels to be added to kibana pod labels. |
+| kibana.extraVolumeMounts | list | `[]` | The definition of extra volumeMounts for kibana. |
+| kibana.extraVolumes | list | `[]` | The definition of extra volumes for kibana. |
 | kibana.image | string | `nil` | The image that should be used. By default ECK will use the official Elasticsearch images.  Overwrite this to use an image from an internal registry or any custom images. Make sure that the image corresponds to the version field. |
 | kibana.livenessProbe | object | `{}` | Configure Kibana's livenessProbe. |
 | kibana.podSecurityContext | object | `{}` | The pod securityContext for kibana pod. |