androidndk/core: add LICENSE and README

Change-Id: I1a0b9d8e3badc78459141bfa4692e83cc021e80f

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]
+    (http://code.google.com/legal/individual-cla-v1.0.html).
+  * If you work for a company that wants to allow you to contribute your work,
+    then you'll need to sign a [corporate CLA]
+    (http://code.google.com/legal/corporate-cla-v1.0.html).
+
+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. Sign a Contributor License Agreement, if you have not yet done so (see
+   details above).
+1. Create your change to the repo in question.
+    * Fork the desired repo, develop and test your code changes.
+    * Ensure that your code is clear and comprehensible.
+    * Ensure that your code has an appropriate set of unit tests which all pass.
+1. Submit a pull request.
+1. The repo owner will review your request. If it is approved, the change will
+   be merged. If it needs additional work, the repo owner will respond with
+   useful comments.
+
+## Contributing a New Sample App
+
+1. Sign a Contributor License Agreement, if you have not yet done so (see
+   details above).
+1. Create your own repo for your app following this naming convention:
+    * mirror-{app-name}-{language or plaform}
+    * apps: quickstart, photohunt-server, photohunt-client
+    * example:  mirror-quickstart-android
+    * For multi-language apps, concatenate the primary languages like this:
+      mirror-photohunt-server-java-python.
+
+1. Create your sample app in this repo.
+    * Be sure to clone the README.md, CONTRIBUTING.md and LICENSE files from the
+      googlecast repo.
+    * Ensure that your code is clear and comprehensible.
+    * Ensure that your code has an appropriate set of unit tests which all pass.
+    * Instructional value is the top priority when evaluating new app proposals for
+      this collection of repos.
+1. Submit a request to fork your repo in googlecast organization.
+1. The repo owner will review your request. If it is approved, the sample will
+   be merged. If it needs additional work, the repo owner will respond with 
+   useful comments.

LICENSE

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+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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README.md

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+NDK Samples
+===========
+
+This repository contains samples for [Android NDK][0].
+
+Pre-requisites
+--------------
+
+- [Android NDK][0]
+
+Getting Started
+---------------
+
+These samples use the NDK build system, you can build them by
+following the instructions in the
+[NDK documentation](https://developer.android.com/tools/sdk/ndk/index.html#Samples).
+
+Support
+-------
+
+- [Google+ Community](https://plus.google.com/communities/105153134372062985968)
+- [Stack Overflow](http://stackoverflow.com/questions/tagged/android)
+
+If you've found an error in this sample, please [file an issue](https://github.com/googlesamples/android-ndk/issues/new).
+
+Patches are encouraged, and may be submitted by [forking this project](https://github.com/googlesamples/android-ndk/fork) and
+submitting a pull request through GitHub. Please see [CONTRIBUTING.md](CONTRIBUTING.md) for more details.
+
+License
+-------
+
+Copyright 2015 The Android Open Source Project, 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.
+
+[LICENSE](LICENSE)
+
+[0]: https://developer.android.com/tools/sdk/ndk/