Add Argo and k8s questions

Also updated Datadog questions.

topics/kubernetes/exercises/kustomize_common_labels/exercise.md

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+# Kustomize - Common Labels
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Kustomize binary installed
+
+## Objectives
+
+In the current directory there is an app composed of a Deployment and Service.
+
+1. Write a kustomization.yml file that will add to both the Service and Deployment the label "team-name: aces"
+2. Execute a kustomize command that will generate the customized k8s files with the label appended
+
+## Solution
+
+Click [here](solution.md) to view the solution

topics/kubernetes/exercises/kustomize_common_labels/solution.md

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+# Kustomize - Common Labels
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Kustomize binary installed
+
+## Objectives
+
+In the current directory there is an app composed of a Deployment and Service.
+
+1. Write a kustomization.yml file that will add to both the Service and Deployment the label "team-name: aces"
+2. Execute a kustomize command that will generate the customized k8s files with the label appended
+
+## Solution
+
+1. Add the following to kustomization.yml in someApp directory:
+
+```
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+commonLabels:
+  team-name: aces
+
+resources:
+  - service.yml
+  - deployment.yml
+```
+
+2. Run `kustomize build someApp`

topics/kubernetes/exercises/kustomize_common_labels/someApp/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+  labels:
+    app: nginx
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.14.2
+        ports:
+        - containerPort: 80

topics/kubernetes/exercises/kustomize_common_labels/someApp/service.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: my-service
+spec:
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 9376