Add Datadog and ArgoCD questions

As well as exercises.

topics/argo/exercises/sync_app_git/exercise.md

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+# Sync App - Git
+
+## 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. Create a new application using the UI or CLI
+   1. App Name: app-demo
+   2. Project: project-demo
+   3. Kubernetes namespace: default
+2. Sync the application
+3. Verify the application is running by executing `kubectl get deploy` in the `default` namespace
+4. Now make a change in your repository to one of the Kubernetes manifests (e.g. update deployment tag)
+5. Go back to ArgoCD and check the state of the app
+6. Sync the state of the application
+
+## Solution
+
+Click [here](solution.md) to view the solution
+
+### UI
+
+1. Click on "New App"
+   1. Insert application name: `app-demo`
+   2. Insert project: `project-demo`
+   3. Under source put the repository URL to your GitHub repo with Kubernetes manifests
+      1. Set path of your application
+   4. Under destination put the address of your Kubernetes cluster and set namespace to `default`
+   5. Click on "Create"
+2. Click on the newly created application
+   1. Click on the "sync button" and click on "Synchronize"
+3. Make a change in your Git repo where the Kubernetes manifests are
+   1.  `git add .`
+   2.  `git commit -a`
+   3.  `git push origin <BRANCH_NAME>`
+4.  Go back to ArgoCD UI and check the status of the app
+    1.  You should see it's "out-of-sync". If you don't, you may want to click on "Refresh"
+    2.  You can also click on "App diff" to see the difference that led to "out-of-sync"
+5.  Click on "Sync" and "Synchronize" to sync the application
+
+### CLI 
+
+```
+argocd app create app-demo \
+--project project-demo \
+--repo https://fake.repo.address \
+--path ./some_app_path \
+--dest-namespace default \
+--dest-server my.kubernetes.cluster
+
+# In the Git repo
+cd <git repo>
+vi <k8s manifest>
+git add .
+git commit -a
+git push origin <BRANCH_NAME>
+
+# Check app state
+argocd app get app-demo
+
+# Sync app state
+argocd app sync app-demo
+argocd app wait app-demo
+```