Add Readme

Author: xinyunh0929

jobs/cjd_sample/README.md

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+# Google Cloud Job Discovery API Samples
+
+## Description
+
+These samples show how to use the [Google Cloud Job Discovery API]
+(https://cloud.google.com/job-discovery/).
+
+## Build and Run
+1.  **Enable APIs** - [Enable the Job Discovery API](https://console.cloud.google.com/flows/enableapi?apiid=jobs.googleapis.com)
+    and create a new project or select an existing project.
+2.  **Activate your Credentials** - If you do not already have an active set of credentials, create and download a [JSON Service Account key](https://pantheon.corp.google.com/apis/credentials/serviceaccountkey). Set the environment variable `GOOGLE_APPLICATION_CREDENTIALS` as the path to the downloaded JSON file.
+4.  **Clone the repo** and cd into this directory
+
+    ```
+    $ git clone https://github.com/GoogleCloudPlatform/php-docs-samples
+    $ cd php-docs-samples/jobs/cjd_sample
+```
+5.  **Install dependencies** via [Composer](http://getcomposer.org/doc/00-intro.md).
+    Run `php composer.phar install` (if composer is installed locally) or `composer install`
+    (if composer is installed globally).
+6.  Run `php quickstart.php`.
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../LICENSE)