Check in Cloud Job Discovery quick start (#684)

* First CJD sample

* Add README

* fix the lint issue

* Add test

* Modify the sample

* Modify the copyright

jobs/cjd_sample/README.md

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+<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google Cloud Platform logo" title="Google Cloud Platform" align="right" height="96" width="96"/>
+
+# Google Cloud Job Discovery API Samples
+
+Cloud Job Discovery is part of Google for Jobs - a Google-wide commitment to help
+people find jobs more easily. Job Discovery provides plug and play access to 
+Google’s search and machine learning capabilities, enabling the entire recruiting
+ecosystem - company career sites, job boards, applicant tracking systems, and
+staffing agencies to improve job site engagement and candidate conversion.
+
+## Table of Contents
+
+* [Setup](#setup)
+* [Running the tests](#running-the-tests)
+
+## Setup
+
+1.  Read [Prerequisites][prereq] and [How to run a sample][run] first.
+1.  Install dependencies:
+
+    With **npm**:
+
+        npm install
+
+    With **yarn**:
+
+        yarn install
+
+[prereq]: ../README.md#prerequisites
+[run]: ../README.md#how-to-run-a-sample
+
+## Running the tests
+
+1.  Set the **GCLOUD_PROJECT** and **GOOGLE_APPLICATION_CREDENTIALS** environment variables.
+
+1.  Run the tests:
+
+    With **npm**:
+
+        npm test
+
+    With **yarn**:
+
+        yarn test

jobs/cjd_sample/package.json

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+{
+  "name": "nodejs-docs-samples-jobs",
+  "version": "0.0.1",
+  "private": true,
+  "license": "Apache-2.0",
+  "author": "Google Inc.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
+  },
+  "engines": {
+    "node": ">=4.3.2"
+  },
+  "scripts": {
+    "lint": "repo-tools lint",
+    "pretest": "npm run lint",
+    "test": "repo-tools test run --cmd ava -- -T 20s --verbose system-test/*.test.js"
+  },
+  "dependencies": {
+    "googleapis": "27.0.0",
+    "safe-buffer": "5.1.1",
+    "uuid": "^3.2.1",
+    "yargs": "11.0.0"
+  },
+  "devDependencies": {
+    "@google-cloud/nodejs-repo-tools": "2.2.5",
+    "ava": "0.25.0",
+    "proxyquire": "2.0.1",
+    "semistandard": "^12.0.1"
+  }
+}

jobs/cjd_sample/quickstart.js

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+/**
+ * Copyright 2018, 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.
+ */
+
+'use strict';
+
+// [START quickstart]
+
+// Imports the Google APIs client library
+const {google} = require('googleapis');
+
+// Acquires credentials
+google.auth.getApplicationDefault((err, authClient) => {
+  if (err) {
+    console.error('Failed to acquire credentials');
+    console.error(err);
+    return;
+  }
+
+  if (authClient.createScopedRequired && authClient.createScopedRequired()) {
+    authClient = authClient.createScoped([
+      'https://www.googleapis.com/auth/jobs'
+    ]);
+  }
+
+  // Instantiates an authorized client
+  const jobs = google.jobs({
+    version: 'v2',
+    auth: authClient
+  });
+
+  // Lists companies
+  jobs.companies.list((err, result) => {
+    if (err) {
+      console.error(err);
+      return;
+    }
+
+    console.log(`Request ID: ${result.data.metadata.requestId}`);
+
+    const companies = result.data.companies || [];
+
+    if (companies.length) {
+      console.log('Companies:');
+      companies.forEach((company) => console.log(company.name));
+    } else {
+      console.log(`No companies found.`);
+    }
+  });
+});
+// [END quickstart]

jobs/cjd_sample/system-test/quickstart.test.js

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+/**
+ * Copyright 2018, 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.
+ */
+
+'use strict';
+
+const test = require(`ava`);
+const tools = require(`@google-cloud/nodejs-repo-tools`);
+
+test(`should list companies`, async t => {
+  const output = await tools.runAsync(`node quickstart.js`);
+  t.true(output.includes(`Request ID`));
+});