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

learn/learn-kubernetes-master/kiamol/ch19/pi/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: pi-web
+  labels:
+    kiamol: ch19
+spec:
+  selector:
+    matchLabels:
+      app: pi-web
+  template:
+    metadata:
+      labels:
+        app: pi-web
+    spec:
+      containers:
+        - image: kiamol/ch05-pi
+          command: ["dotnet", "Pi.Web.dll", "-m", "web"]
+          name: web
+          ports:
+            - containerPort: 80
+              name: http
+          resources:
+            limits:
+              cpu: 250m
+            requests:
+              cpu: 125m

learn/learn-kubernetes-master/kiamol/ch19/pi/hpa-cpu.yaml

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+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: pi-cpu
+  labels:
+    kiamol: ch19
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: pi-web
+  minReplicas: 1
+  maxReplicas: 5
+  targetCPUUtilizationPercentage: 75

learn/learn-kubernetes-master/kiamol/ch19/pi/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: pi-web
+  labels:
+    kiamol: ch19
+spec:
+  ports:
+    - port: 8031
+      targetPort: http
+  selector:
+    app: pi-web
+  type: LoadBalancer

learn/learn-kubernetes-master/kiamol/ch19/pi/update/hpa-cpu-v2.yaml

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+apiVersion: autoscaling/v2beta2  
+kind: HorizontalPodAutoscaler
+metadata:
+  name: pi-cpu
+  labels:
+    kiamol: ch19
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: pi-web
+  minReplicas: 1
+  maxReplicas: 5  
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu      
+      target: 
+        type: Utilization
+        averageUtilization: 75
+  behavior:
+    scaleDown:
+      stabilizationWindowSeconds: 30
+      policies:
+      - type: Percent
+        value: 50
+        periodSeconds: 15