Add README.md and CONTRIBUTING.md files

CONTRIBUTING.md

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+# How to become a contributor and submit your own code
+
+## Contributor License Agreements
+
+We'd love to accept your sample apps and patches! Before we can take them, we
+have to jump a couple of legal hurdles.
+
+Please fill out either the individual or corporate Contributor License Agreement (CLA).
+
+  * If you are an individual writing original source code and you're sure you
+    own the intellectual property, then you'll need to sign an [individual CLA]
+    (https://cla.developers.google.com/about/google-individual).
+  * If you work for a company that wants to allow you to contribute your work,
+    then you'll need to sign a [corporate CLA]
+    (https://developers.google.com/open-source/cla/corporate).
+
+Follow either of the two links above to access the appropriate CLA and
+instructions for how to sign and return it. Once we receive it, we'll be able to
+accept your pull requests.
+
+## Contributing A Patch
+
+1. Submit an issue describing your proposed change to the repo in question.
+1. The repo owner will respond to your issue promptly.
+1. If your proposed change is accepted, and you haven't already done so, sign a
+   Contributor License Agreement (see details above).
+1. Fork the desired repo, develop and test your code changes.
+1. Ensure that your code adheres to the existing style in the sample to which
+   you are contributing. Refer to the
+   [Android Code Style Guide]
+   (https://source.android.com/source/code-style.html) for the
+   recommended coding standards for this organization.
+1. Ensure that your code has an appropriate set of unit tests which all pass.
+1. Submit a pull request.
+

README.md

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+# Google Cloud Messaging
+
+Google Cloud Messaging for Android (GCM) is a service that helps developers send
+data from servers to their Android applications on Android devices. The service
+provides a simple, lightweight mechanism that servers can use to tell mobile
+applications to contact the server directly, to fetch updated application or
+user data. The GCM service handles all aspects of queueing of messages and
+delivery to the target Android application running on the target device.
+
+This project contains sample code and legacy client libraries for interfacing
+with GCM. Newer applications should instead include the Google Play Services
+library via their Gradle configuration:
+
+    dependencies {
+      compile "com.google.android.gms:play-services:3.1.+"
+    }
+
+Information on GCM, including an overview and integration instructions, can
+be found on the Android Developers website:
+
+http://developer.android.com/guide/google/gcm/index.html
+
+## Support
+
+- Google+ Community: https://plus.sandbox.google.com/communities/105153134372062985968
+- Stack Overflow: http://stackoverflow.com/questions/tagged/android-gcm
+
+If you've found an error in this project's code, please file an issue:
+https://github.com/google/gcm/issues
+
+Patches are encouraged, and may be submitted by forking this project and
+submitting a pull request through GitHub. See CONTRIBUTING.md for more details.
+
+## License
+
+Copyright 2015 Google, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you 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.