Added Kubernetes resources for TLS setup, updated docs

argocd/cluster-resources/cluster-issuers.yaml

@@ -0,0 +1,23 @@
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: letsencrypt-http01
+  annotations:
+    argocd.argoproj.io/sync-wave: "20"
+    argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true
+spec:
+  acme:
+    server: https://acme-v02.api.letsencrypt.org/directory
+    # Add your email address here
+    email: you@yourdomain.com
+    privateKeySecretRef:
+      name: letsencrypt-http01-cluster-issuer-account-key
+    solvers:
+      - http01:
+          gatewayHTTPRoute:
+            parentRefs:
+              - name: acme
+                namespace: network
+                sectionName: http
+                kind: Gateway
+---