Add Datadog and ArgoCD questions

As well as exercises.

topics/argo/exercises/sync_app_cluster/exercise.md

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+# Sync App - Cluster
+
+## Requirements
+
+1. Make sure you have a Kubernetes cluster running with ArgoCD installed
+1. Make sure you have an app deployed in the cluster and tracked by ArgoCD
+
+## Objectives
+
+1. Verify the app is tracked by ArgoCD and in sync
+2. . Make a change to your application by running a `kubectl` command. The change can anything:
+   1. Changing the tag of the image
+   2. Changing the number of replicas
+   3. You can go extreme and delete the resource if you would like :)
+3. Check the app state in ArgoCD
+4. Sync the app state
+
+## Solution
+
+Click [here](solution.md) to view the solution