Add argocd install instructions

Author: marcelldls

docs/tutorials/setup_k8s.md

@@ -145,6 +145,32 @@ kubectl config set-context t03-beamline --namespace=t03-beamline --user=default
 kubectl config use-context t03-beamline
 ```
 
+### Set up Argo CD
+
+Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. As per <https://argo-cd.readthedocs.io/en/stable/> it can be installed into the cluster as follows:
+
+```
+kubectl create namespace argocd
+kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
+```
+
+To access the gui through a browser on `https://localhost:8080/`:
+```
+kubectl port-forward svc/argocd-server -n argocd 8080:443
+```
+
+The user is `admin` and the password can be retrived using:
+```
+kubectl -n argocd get secret argocd-initial-admin-secret -o jsonpath="{.data.password}" | base64 --decode ; echo
+```
+
+To install the `argocd` cli tool:
+```
+curl -sSL -o argocd-linux-amd64 https://github.com/argoproj/argo-cd/releases/latest/download/argocd-linux-amd64
+sudo install -m 555 argocd-linux-amd64 /usr/local/bin/argocd
+rm argocd-linux-amd64
+```
+
 ### Completed
 
 That's it. You now have installed the necessary software to start experimenting with IOCs on Kubernetes.