新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch20/user-controller/01-service-account.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: user-controller
+  labels:
+    kiamol: ch20
+automountServiceAccountToken: false

learn/learn-kubernetes-master/kiamol/ch20/user-controller/02-rbac.yaml

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+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: user-controller
+  labels:
+    kiamol: ch20
+rules:
+- apiGroups: [""] 
+  resources: ["namespaces", "serviceaccounts"]
+  verbs: ["list", "create", "delete"]
+- apiGroups: [""] 
+  resources: ["secrets"]
+  verbs: ["list", "create"]
+- apiGroups: ["ch20.kiamol.net"] 
+  resources: ["users"]
+  verbs: ["list", "watch"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: user-controller
+  labels:
+    kiamol: ch20
+subjects:
+- kind: ServiceAccount
+  name: user-controller
+  namespace: default
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: user-controller

learn/learn-kubernetes-master/kiamol/ch20/user-controller/03-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: user-controller
+  labels:
+    kiamol: ch20
+spec:
+  selector:
+    matchLabels:
+      app: user-controller
+  template:
+    metadata:
+      labels:
+        app: user-controller
+    spec:
+      serviceAccountName: user-controller
+      automountServiceAccountToken: true
+      containers:
+        - image: kiamol/ch20-user-controller
+          name: controller