docs: add tutorial to build a multi-cluster application

docs/tutorials/BuildMultiClusterApplication/testfiles/crp-multi-cluster-app.yaml

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+apiVersion: placement.kubernetes-fleet.io/v1
+kind: ClusterResourcePlacement
+metadata:
+  name: crp-multi-cluster-app
+spec:
+  resourceSelectors:
+    - group: ""
+      kind: Namespace
+      name: multi-cluster-app
+      version: v1
+  policy:
+    placementType: PickAll

docs/tutorials/BuildMultiClusterApplication/testfiles/envelop-object.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: envelope-configmap
+  namespace: multi-cluster-app
+  annotations:
+    kubernetes-fleet.io/envelope-configmap: "true"
+data:
+  nginx-deployment.yaml: |
+    apiVersion: apps/v1
+    kind: Deployment
+    metadata:
+      name: nginx-deployment
+      namespace: multi-cluster-app
+    spec:
+      replicas: 2
+      selector:
+        matchLabels:
+          app: nginx
+      template:
+        metadata:
+          labels:
+            app: nginx
+        spec:
+          containers:
+            - name: nginx
+              image: nginx:1.16.1
+              ports:
+                - containerPort: 80
+

docs/tutorials/BuildMultiClusterApplication/testfiles/member-cluster-2.yaml

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+apiVersion: cluster.kubernetes-fleet.io/v1
+kind: MemberCluster
+metadata:
+  labels:
+    cluster-name: member-2
+  name: member-2
+spec:
+  identity:
+    kind: ServiceAccount
+    name: fleet-member-agent-2
+    namespace: fleet-system

docs/tutorials/BuildMultiClusterApplication/testfiles/nginx-backend.yaml

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+apiVersion: networking.fleet.azure.com/v1alpha1
+kind: TrafficManagerBackend
+metadata:
+  name: nginx-backend
+  namespace: multi-cluster-app
+spec:
+  profile:
+    name: "nginx-profile"
+  backend:
+    name: "nginx-service"
+  weight: 100

docs/tutorials/BuildMultiClusterApplication/testfiles/nginx-profile.yaml

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+apiVersion: networking.fleet.azure.com/v1alpha1
+kind: TrafficManagerProfile
+metadata:
+  name: nginx-profile
+  namespace: multi-cluster-app
+spec:
+  monitorConfig:
+    port: 80

docs/tutorials/BuildMultiClusterApplication/testfiles/nginx-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+  namespace: multi-cluster-app
+spec:
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80
+  type: LoadBalancer
+---
+apiVersion: networking.fleet.azure.com/v1alpha1
+kind: ServiceExport
+metadata:
+  name: nginx-service
+  namespace: multi-cluster-app
+

docs/tutorials/BuildMultiClusterApplication/testfiles/ro-nginx-service.yaml

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+apiVersion: placement.kubernetes-fleet.io/v1alpha1
+kind: ResourceOverride
+metadata:
+  name: ro-nginx-service
+  namespace: multi-cluster-app
+spec:
+  resourceSelectors:
+    -  group: ""
+       kind: Service
+       version: v1
+       name: nginx-service
+  policy:
+    overrideRules:
+      - clusterSelector:
+          clusterSelectorTerms:
+            - labelSelector:
+                matchLabels:
+                  cluster-name: member-1
+        jsonPatchOverrides:
+          - op: add
+            path: /metadata/annotations
+            value:
+              {"service.beta.kubernetes.io/azure-dns-label-name":"fleet-multi-cluster-app-member-1"}
+      - clusterSelector:
+          clusterSelectorTerms:
+            - labelSelector:
+                matchLabels:
+                  cluster-name: member-2
+        jsonPatchOverrides:
+          - op: add
+            path: /metadata/annotations
+            value:
+              { "service.beta.kubernetes.io/azure-dns-label-name": "fleet-multi-cluster-app-member-2" }