Add FAQ for knative setup.

site/content/en/docs/faq/_index.md

@@ -23,3 +23,9 @@ Alternatively, configure `sudo` to never prompt for the commands issued by minik
 minikube's bootstrapper, [Kubeadm] (https://github.com/kubernetes/kubeadm) verifies a list of features on the host system before installing Kubernetes. in case you get this error, and you still want to try minikube anyways despite your system's limitation you can skip the verification by starting minikube with this extra option:
 
 `minikube start --extra-config kubeadm.ignore-preflight-errors=SystemVerification`
+
+## what is the resource allocation for Knative Setup using minikube?
+
+Please allocate sufficient resources for Knative setup using minikube, especially when you run a minikube cluster on your local machine. We recommend allocating at least 6 CPUs and 8G memory.
+
+`minikube start --cpus 6 --memory 8000`