Create tutorial for using a static token file.

site/content/en/docs/tutorials/token-auth-file.md

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+---
+title: "Using Static Token file"
+linkTitle: "Using Static Token file"
+weight: 1
+date: 2021-08-04
+description: >
+  Using a static token file in Minikube
+---
+
+## Overview
+
+A [static token file](https://kubernetes.io/docs/reference/access-authn-authz/authentication/#static-token-file) can be used to ensure only authenticated users access the API server. As minikube nodes are run in VMs/containers, this adds a complication to ensuring this token file is accessable to the node. This tutorial explains how to configure a static token file.
+
+## Tutorial
+
+This must be done before creating the minikube cluster.
+
+```shell
+# Create the folder that will be copied into the control plane.
+mkdir -p ~/.minikube/files/etc/ca-certificates/
+
+# Copy the token file into the folder.
+cp token.csv ~/.minikube/files/etc/ca-certificates/token.csv
+
+# Start minikube with the token auth file specified.
+minikube start \
+  --extra-config=apiserver.token-auth-file=/etc/ca-certificates/token.csv
+```
+
+Placing files in `~/.minikube/files/` automatically copies them to the specified path in each minikube node. This means once we call `minikube start`, it is able to access the token file since it is locally present in the node.