Update README showing the Shared VPC use case

tests/modules/cloud_run/examples/connector-shared.yaml

@@ -0,0 +1,53 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+values:
+  module.cloud_run.google_cloud_run_service.service:
+    autogenerate_revision_name: false
+    location: europe-west1
+    metadata:
+    - {}
+    name: hello
+    project: project-id
+    template:
+    - metadata:
+      - labels: null
+      spec:
+      - containers:
+        - args: null
+          command: null
+          env: []
+          env_from: []
+          image: us-docker.pkg.dev/cloudrun/container/hello
+          liveness_probe: []
+          volume_mounts: []
+          working_dir: null
+        volumes: []
+    timeouts: null
+  module.cloud_run.google_vpc_access_connector.connector[0]:
+    ip_cidr_range: null
+    machine_type: e2-micro
+    max_throughput: 300
+    min_throughput: 200
+    name: hello
+    project: project-id
+    region: europe-west1
+    subnet:
+    - name: subnet-vpc-access
+      project_id: host-project
+    timeouts: null
+
+counts:
+  google_cloud_run_service: 1
+  google_vpc_access_connector: 1