GoogleOauth2.0 First implementation

First try for GoogleOauth2.0

express-server/node_modules/googleapis-common/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 APIs Common Module: Node.js Client](https://github.com/google/google-api-nodejs-client)
+
+[![release level](https://img.shields.io/badge/release%20level-alpha-orange.svg?style&#x3D;flat)](https://cloud.google.com/terms/launch-stages)
+
+> Node.js googleapis common package
+
+Google Cloud Common node.js module contains stuff used by other Cloud API modules.
+
+* [github.com/googlecloudplatform/google-cloud-node](https://github.com/googlecloudplatform/google-cloud-node)
+
+Read more about the client libraries for Cloud APIs, including the older
+Google APIs Client Libraries, in [Client Libraries Explained][explained].
+
+[explained]: https://cloud.google.com/apis/docs/client-libraries-explained
+
+**Table of contents:**
+
+* [Quickstart](#quickstart)
+  * [Before you begin](#before-you-begin)
+  * [Installing the client library](#installing-the-client-library)
+  * [Using the client library](#using-the-client-library)
+* [Versioning](#versioning)
+* [Contributing](#contributing)
+* [License](#license)
+
+## Quickstart
+
+### Before you begin
+
+1.  Select or create a Cloud Platform project.
+
+    [Go to the projects page][projects]
+
+1.  Enable billing for your project.
+
+    [Enable billing][billing]
+
+1.  [Set up authentication with a service account][auth] so you can access the
+    API from your local workstation.
+
+[projects]: https://console.cloud.google.com/project
+[billing]: https://support.google.com/cloud/answer/6293499#enable-billing
+[auth]: https://cloud.google.com/docs/authentication/getting-started
+
+### Installing the package
+
+    npm install --save googleapis-common
+
+It's unlikely you will need to install this package directly, as it will be
+installed as a dependency when you install other `@google` packages.
+
+## Versioning
+
+This library follows [Semantic Versioning](http://semver.org/).
+
+This library is considered to be in **alpha**. This means it is still a
+work-in-progress and under active development. Any release is subject to
+backwards-incompatible changes at any time.
+
+More Information: [Google Cloud Platform Launch Stages][launch_stages]
+
+[launch_stages]: https://cloud.google.com/terms/launch-stages
+
+## Contributing
+
+Contributions welcome! See the [Contributing Guide](https://github.com/googlecloudplatform/google-cloud-node/blob/master/.github/CONTRIBUTING.md).
+
+## License
+
+Apache Version 2.0
+
+See [LICENSE](https://github.com/googlecloudplatform/google-cloud-node/blob/master/LICENSE)
+
+[shell_img]: http://gstatic.com/cloudssh/images/open-btn.png