add script to install argocd using helm

scripts/install-argocd.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -e
+
+kubectl create namespace argocd || echo "Namespace argocd already exists"
+helm repo add argo https://argoproj.github.io/argo-helm || echo "Argo repo already exists"
+helm install argocd -n argocd -f argocd-values.yaml argo/argocd --version 7.3.6