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

learn/learn-kubernetes-master/kiamol/ch20/users/crd/user-crd.yaml

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+apiVersion: apiextensions.k8s.io/v1
+kind: CustomResourceDefinition
+metadata:
+  name: users.ch20.kiamol.net
+  labels:
+    kiamol: ch20
+spec:
+  group: ch20.kiamol.net
+  scope: Namespaced
+  names:
+    plural: users
+    singular: user
+    kind: User
+  versions:
+    - name: v1
+      served: true
+      storage: true
+      schema:
+        openAPIV3Schema:
+          type: object
+          properties:
+            spec:
+              type: object
+              properties:
+                email:
+                  type: string
+                group:
+                  type: string
+      additionalPrinterColumns:
+        - name: Email
+          type: string
+          description: Email Address
+          jsonPath: .spec.email
+        - name: Group
+          type: string
+          description: Group
+          jsonPath: .spec.group

learn/learn-kubernetes-master/kiamol/ch20/users/update/user-sre4.yaml

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+apiVersion: "ch20.kiamol.net/v1"
+kind: User
+metadata:
+  name: sre4
+  labels:
+    kiamol: ch20
+spec:
+  email: sre4@kiamol.net
+  group: sre

learn/learn-kubernetes-master/kiamol/ch20/users/user-sre3.yaml

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+apiVersion: "ch20.kiamol.net/v1"
+kind: User
+metadata:
+  name: sre3
+  labels:
+    kiamol: ch20
+spec:
+  email: sre3@kiamol.net
+  group: sre

learn/learn-kubernetes-master/kiamol/ch20/users/user-tester3.yaml

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+apiVersion: "ch20.kiamol.net/v1"
+kind: User
+metadata:
+  name: tester3
+  labels:
+    kiamol: ch20
+spec:
+  email: tester3@kiamol.net
+  group: test