Add system design notebook image

As well as two Kubernetes basic exercises.

exercises/kubernetes/pods_01.md

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+## Pods 01
+
+#### Objective
+
+Learn how to create pods
+
+#### Instructions
+
+1. Choose a container image (e.g. redis, nginx, mongo, etc.)
+2. Create a pod (in the default namespace) using the image you chose
+3. Verify the pod is running

exercises/kubernetes/services_01.md

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+## Services 01
+
+#### Objective
+
+Learn how to create services
+
+#### Instructions
+
+1. Create a pod running ngnix
+2. Create a service for the pod you've just created
+3. Verify the app is reachable

exercises/kubernetes/solutions/pods_01_solution.md

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+## Pods 01 - Solution
+
+```
+kubectl run nginx --image=nginx --restart=Never
+kubectl get pods
+```

exercises/kubernetes/solutions/services_01_solution.md

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+## 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
+```