[Installing an Cert-Manager]
$ helm repo add jetstack https://charts.jetstack.io
$ helm repo update
$ helm install cert-manager jetstack/cert-manager --namespace cert-manager --create-namespace --set installCRDs=true

[Install an Nginx Ingress Controller on Kubernetes Cluster using Helm]
$ helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
$ helm update
$ helm install ingress-controller ingress-nginx/ingress-nginx
