Add Datadog and ArgoCD questions

As well as exercises.

topics/argo/exercises/app_creation/exercise.md

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+# App Creation
+
+## Requirements
+
+1. Make sure you have repository with some Kubernetes manifests
+2. Make sure you have a Kubernetes cluster running with ArgoCD installed
+
+## Objectives
+
+1. Using the CLI or the UI, create a a new application with the following properties:
+   1. app name: app-demo
+   2. project: app-project
+   3. repository URL: your repo with some k8s manifests
+   4. namespace: default
+2. Verify the app was created
+3. Sync the app
+4. Verify Kubernetes resources were created
+5. Delete the app
+
+## Solution
+
+Click [here](solution.md) to view the solution

topics/argo/exercises/app_creation/solution.md

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+# App Creation
+
+## Requirements
+
+1. Make sure you have repository with some Kubernetes manifests
+2. Make sure you have a Kubernetes cluster running with ArgoCD installed
+
+## Objectives
+
+1. Using the CLI or the UI, create a a new application with the following properties:
+   1. app name: app-demo
+   2. project: app-project
+   3. repository URL: your repo with some k8s manifests
+   4. namespace: default
+2. Verify the app was created
+3. Sync the app
+4. Verify Kubernetes resources were created
+5. Delete the app
+
+## Solution
+
+### UI
+
+1. Click on "New App"
+   1. Insert application name: `app-demo`
+   2. Insert project: `app-project`
+   3. Under source put the repository URL to your GitHub repo with Kubernetes manifests
+      1. Set the path for your application
+   4. Under destination put the address of your Kubernetes cluster and set namespace to `default`
+   5. Click on "Create"
+2. Click on "Sync" button on the "app-demo" form
+   1. Click on "Synchronize"
+3. Verify the Kubernetes resources were created
+   1. `kubectl get deployments`
+4. Delete the app
+
+### CLI
+
+```
+argocd app create app-demo \
+--project app-project \
+--repo https://fake.repo.address \
+--path ./some_app_path \
+--dest-namespace default \
+--dest-server my.kubernetes.cluster
+
+# Check app state
+argocd app list
+argocd app get app-demo
+
+# Sync app state
+argocd app sync app-demo
+argocd app wait app-demo
+
+# Verify kubernetes resources were created
+kubectl get deployments
+
+# Delete the app
+argocd app delete app-demo
+```