Add description for a 1-click install and usage of Kubernetes Dashboard on DigitalOcean

deployment/src/kubernetes/DigitalOcean.md

@@ -49,6 +49,43 @@ Skip `Patch & Minor Version Upgrades` for now.
 You don't need a 1-click app. Our helmet script will install the required NGINXs.
 Therefore, skip this step as well.
 
+For a 1-click Kubernetes Dashboard, follow the next step.
+
+## Install Kubernetes Dashboard
+
+We recommend installing a Kubernetes Dashboard, as DigitalOcean no longer offers a pre-installed dashboard.
+
+- 1-click-deployment of [Kubernetes Dashboard on DigitalOcean marketplace](https://marketplace.digitalocean.com/apps/kubernetes-dashboard)
+
+There you will also find a section entitled `Getting Started`, which describes how you can log in from your local computer.
+
+Very short description:
+
+### In your DigitalOcean Account
+
+For authentication, download the current cluster configuration file from DigitalOcean.
+
+### In Terminal
+
+Set the context of the cluster by command:
+
+```bash
+$ kubectl config use-context <context-name>
+```
+
+Port-forward the Kubernetes Dashboard to your local machine:
+
+```bash
+# save pod name
+$ export POD_NAME=$(kubectl get pods -n kubernetes-dashboard -l "app.kubernetes.io/name=kubernetes-dashboard,app.kubernetes.io/instance=kubernetes-dashboard" -o jsonpath="{.items[0].metadata.name}")
+# forward port
+$ kubectl -n kubernetes-dashboard port-forward $POD_NAME 8443:8443
+```
+
+### Log-In to Kubernetes Dashboard
+
+Access the URL in your local web browser at <https://127.0.0.1:8443/>, and log in using your Kubernetes cluster credentials – downloaded config file. You may encounter a certificate warning, so make sure to override it.
+
 ## DNS Configuration
 
 There are the following two ways to set up the DNS.