Add Datadog and ArgoCD questions

As well as exercises.

topics/argo/exercises/argocd_helm_app/exercise.md

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+# ArgoCD Helm App
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. ArgoCD installed on the k8s cluster
+3. Repository of an Helm chart
+
+## Objectives
+
+1. Create a new app in ArgoCD that points to the repo of your Helm chart
+
+## Solution
+
+Click [here](solution.md) to view the solution

topics/argo/exercises/argocd_helm_app/solution.md

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+# ArgoCD Helm App
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. ArgoCD installed on the k8s cluster
+3. Repository of an Helm chart
+
+## Objectives
+
+1. Create a new app in ArgoCD that points to the repo of your Helm chart
+
+## Solution
+
+```
+argocd app create some-app \
+--project default \
+--repo https://repo-with-helm-chart
+--path "./helm" \
+--sync-policy auto \
+--dest-namespace default \
+--dest-server https://kubernetes.cluster
+```