public cluster images added

Signed-off-by: Sourav Roy <souravroy@appscode.com>

Author: Sourav-Kumar-19

docs/platform/guides/cluster-management/add-cluster/self-managed/import-public.md

@@ -19,10 +19,14 @@ section_menu_id: guides
 
 2. In the `Self Managed` section, choose the public cluster option.
 
+![Add Cluster provider selection screen showing Vendor Managed and Self Managed sections with Public option](../../images/add_cluster/add-cluster-select-provider.png)
+
 ### Provide Kubeconfig
 
 3. Provide the kubeconfig for your cluster.
 
+![Provide Kubeconfig screen showing YAML editor for public self-managed cluster](../../images/add_cluster/public-cluster-kubeconfig.png)
+
 ### Customize Features
 
 4. Proceed to the feature customization step.