Add system design notebook image

As well as two Kubernetes basic exercises.

exercises/kubernetes/solutions/pods_01_solution.md

@@ -0,0 +1,6 @@
+## Pods 01 - Solution
+
+```
+kubectl run nginx --image=nginx --restart=Never
+kubectl get pods
+```

exercises/kubernetes/solutions/services_01_solution.md

@@ -0,0 +1,19 @@
+## Services 01 - Solution
+
+```
+kubectl run nginx --image=nginx --restart=Never --port=80 --labels="app=dev-nginx"
+
+cat << EOF > nginx-service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+spec:
+  selector:
+    app: dev-nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 9372
+EOF
+```