Update landing pages for Tasks and Tutorials. (#2634)

docs/tasks/index.md

@@ -6,12 +6,18 @@ This section of the Kubernetes documentation contains pages that
 show how to do individual tasks. A task page shows how to do a
 single thing, typically by giving a short sequence of steps.
 
+#### Using the kubectl Command Line
+
+* [Listing Alll Container Images Running in a Cluster](/docs/tasks/kubectl/list-all-running-container-images/)
+* [Getting a Shell to a Running Container](/docs/tasks/kubectl/get-shell-running-container/)
+
 #### Configuring Pods and Containers
 
 * [Defining Environment Variables for a Container](/docs/tasks/configure-pod-container/define-environment-variable-container/)
 * [Defining a Command and Arguments for a Container](/docs/tasks/configure-pod-container/define-command-argument-container/)
 * [Assigning CPU and RAM Resources to a Container](/docs/tasks/configure-pod-container/assign-cpu-ram-container/)
 * [Configuring a Pod to Use a Volume for Storage](/docs/tasks/configure-pod-container/configure-volume-storage/)
+* [Configuring a Pod to Use a PersistentVolume for Storage](/docs/tasks/configure-pod-container/configure-persistent-volume-storage/)
 * [Exposing Pod Information to Containers Through Environment Variables](/docs/tasks/configure-pod-container/environment-variable-expose-pod-information/)
 * [Exposing Pod Information to Containers Using a DownwardAPIVolumeFile](/docs/tasks/configure-pod-container/downward-api-volume-expose-pod-information/)
 * [Distributing Credentials Securely](/docs/tasks/configure-pod-container/distribute-credentials-secure/)