Add wordpress example for demonstrating variable reference

examples/wordpress/mysql/deployment.yaml

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+apiVersion: apps/v1beta2 # for versions before 1.9.0 use apps/v1beta2
+kind: Deployment
+metadata:
+  name: mysql
+  labels:
+    app: mysql
+spec:
+  selector:
+    matchLabels:
+      app: mysql
+  strategy:
+    type: Recreate
+  template:
+    metadata:
+      labels:
+        app: mysql
+    spec:
+      containers:
+      - image: mysql:5.6
+        name: mysql
+        env:
+        - name: MYSQL_ROOT_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: mysql-pass
+              key: password
+        ports:
+        - containerPort: 3306
+          name: mysql
+        volumeMounts:
+        - name: mysql-persistent-storage
+          mountPath: /var/lib/mysql
+      volumes:
+      - name: mysql-persistent-storage
+        emptyDir: {}

examples/wordpress/mysql/kustomization.yaml

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+resources:
+- deployment.yaml
+- service.yaml
+- secret.yaml

examples/wordpress/mysql/secret.yaml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: mysql-pass
+type: Opaque
+data:
+  # Default password is "admin".
+  password: YWRtaW4=

examples/wordpress/mysql/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: mysql
+  labels:
+    app: mysql
+spec:
+  ports:
+    - port: 3306
+  selector:
+    app: mysql