Adding example for CloudML online prediction

ml_engine/online_prediction/README.md

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+https://cloud.google.com/ml-engine/docs/concepts/prediction-overview

ml_engine/online_prediction/predict.js

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+# Copyright 2017 Google Inc. All Rights Reserved.
+#
+# 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.
+
+var google = require('googleapis');
+
+var ml = google.ml('v1');
+
+function auth(callback) {
+    google.auth.getApplicationDefault(function(err, authClient) {
+        if (err) {
+            return callback(err);
+        }
+
+        if (authClient.createScopedRequired && authClient.createScopedRequired()) {
+            authClient = authClient.createScoped([
+                'https://www.googleapis.com/auth/cloud-platform'
+            ]);
+        }
+        callback(null, authClient);
+    });
+}
+
+var instance = {
+    age: 25,
+    workclass: " Private",
+    education: " 11th",
+    education_num: 7,
+    marital_status: " Never - married",
+    occupation: " Machine - op - inspct",
+    relationship: " Own - child",
+    race: " Black",
+    gender: " Male",
+    capital_gain: 0,
+    capital_loss: 0,
+    hours_per_week: 40,
+    native_country: " United - Stats"
+}
+
+auth(function(err, authClient) {
+    if (err) {
+        console.error(err);
+    } else {
+        var ml = google.ml({
+            version: 'v1',
+            auth: authClient
+        });
+
+        // Predict
+        ml.projects.predict({
+            name: 'projects/op-beta-walkthrough/models/census',
+            resource: {
+                instances: [instance]
+            }
+        }, function(err, result) {
+            if (err) {
+                return callback(err);
+            }
+
+            console.log(JSON.stringify(result));
+        });
+    }
+});
+