Adding all sections to readme, with TODOs for missing content

gcloud-java-pubsub/README.md

@@ -23,3 +23,62 @@ Add this to your pom.xml file
   <version>0.0.10</version>
 </dependency>
 ```
+
+Example Application
+-------------------
+TODO
+
+Authentication
+--------------
+
+See the [Authentication](https://github.com/GoogleCloudPlatform/gcloud-java#authentication) section in the base directory's README.
+
+About Google Cloud Pub/Sub
+--------------------------
+
+[Google Cloud Pub/Sub][cloud-pubsub] is designed to provide reliable,
+many-to-many, asynchronous messaging between applications. Publisher
+applications can send messages to a ``topic`` and other applications can
+subscribe to that topic to receive the messages. By decoupling senders and
+receivers, Google Cloud Pub/Sub allows developers to communicate between
+independently written applications.
+
+TODO: link to docs on activating Pub/Sub, high-level documentation on
+the API, and code snippet
+
+Java Versions
+-------------
+
+Java 7 or above is required for using this client.
+
+Testing
+-------
+
+TODO
+
+Versioning
+----------
+
+This library follows [Semantic Versioning] (http://semver.org/).
+
+It is currently in major version zero (``0.y.z``), which means that anything
+may change at any time and the public API should not be considered
+stable.
+
+Contributing
+------------
+
+Contributions to this library are always welcome and highly encouraged.
+
+See [CONTRIBUTING] for more information on how to get started.
+
+License
+-------
+
+Apache 2.0 - See [LICENSE] for more information.
+
+
+[CONTRIBUTING]:https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/CONTRIBUTING.md
+[LICENSE]: https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/LICENSE
+
+[cloud-pubsub]: https://cloud.google.com/storage/