Add Apache license

.gitignore

@@ -2,6 +2,7 @@
 
 # Xcode
 *.xcuserdatad
+*.xccheckout
 build
 
 # Documentation

LICENSE.txt

@@ -0,0 +1,13 @@
+Copyright 2015 Pascal Pfiffner
+
+Licensed 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.

README.md

@@ -3,15 +3,17 @@ OAuth2
 
 OAuth2 frameworks for **OS X** and **iOS** written in Swift.
 
+Technical documentation is available at [p2.github.io/OAuth2](https://p2.github.io/OAuth2).
+Take a look at the [OS X sample app](https://github.com/p2/OAuth2App) for basic usage of this framework.
+
 The code in this repo requires Xcode 6, the built framework can be used on **OS X 10.9** or **iOS 8** and later.
 To use on **iOS 7** you'll have to include the source files in your main project.
 _Note_ that it's possible to run embedded frameworks in iOS 7 with some tricks, however you will not be able to submit such an App to the App Store.
 Supported OAuth2 [flows](#flows) are the _code grant_ (`response_type=code`) and the _implicit grant_ (`response_type=token`).
 
 Since the Swift language is constantly evolving I am [adding tags](https://github.com/p2/OAuth2/releases) to mark which revision should work with which Swift version.
 
-Technical documentation is available at [p2.github.io/OAuth2](https://p2.github.io/OAuth2).
-Take a look at the [OS X sample app](https://github.com/p2/OAuth2App) for basic usage of this framework.
+Licensed under [Apache 2](LICENSE.txt).
 
 
 Installation