Add Chapter 4 Lecture 4 files

Chapter_Four/Lecture_4_Lab/myapp/ingress-blue.yaml

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+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: blue-ingress
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/ssl-redirect: "false"
+    nginx.ingress.kubernetes.io/rewrite-target: / 
+spec:
+  rules:
+  - host: myapp.example.com
+    http:
+      paths:
+      - path: /blue
+        backend:
+          serviceName: myapp-blue-service
+          servicePort: 80
+

Chapter_Four/Lecture_4_Lab/myapp/ingress-green.yaml

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+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: green-ingress
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/ssl-redirect: "false"
+    nginx.ingress.kubernetes.io/rewrite-target: / 
+spec:
+  rules:
+  - host: myapp.example.com
+    http:
+      paths:
+      - path: /green
+        backend:
+          serviceName: myapp-green-service
+          servicePort: 80
+

Chapter_Four/Lecture_4_Lab/myapp/myapp-blue.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myapp-blue
+  labels:
+    app: myapp
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: myapp
+      version: blue
+  template:
+    metadata:
+      labels:
+        app: myapp
+        version: blue
+    spec:
+      containers:
+      - name: myapp
+        image: gcr.io/tim-acloud-guru/myapp:blue
+        ports:
+        - containerPort: 8888
+

Chapter_Four/Lecture_4_Lab/myapp/myapp-green.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myapp-green
+  labels:
+    app: myapp
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: myapp
+      version: green
+  template:
+    metadata:
+      labels:
+        app: myapp
+        version: green
+    spec:
+      containers:
+      - name: myapp
+        image: gcr.io/tim-acloud-guru/myapp:green
+        ports:
+        - containerPort: 8888
+

Chapter_Four/Lecture_4_Lab/myapp/myapp-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: myapp-blue-service
+spec:
+  selector:
+    app: myapp
+    version: blue
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8888
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: myapp-green-service
+spec:
+  selector:
+    app: myapp
+    version: green
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8888
+