update README

Author: aaronbrethorst

README.md

@@ -1,7 +1,46 @@
 ABReleaseNotesViewController
 ====
 
-Lorem ipsum dolor sit amet.
+`ABReleaseNotesViewController` is an easy-to-use, reasonably attractive way to display your application's release notes in-app. This project was inspired by [https://github.com/iGriever/TWSReleaseNotesView](TWSReleaseNotesView). I've used `TWSReleaseNotesView` in the past, and it was great, but it hasn't been updated in a few years.
+
+![Animated GIF demonstrating the project](http://i.imgur.com/wgwhOY8.gif)
+
+Quickstart
+====
+
+Create your release notes object in your init method, or in `-viewDidLoad`:
+
+    - (void)viewDidLoad {
+      [super viewDidLoad];
+  
+      self.releaseNotes = [ABReleaseNotesViewController releaseNotesControllerWithAppIdentifier:@"329380089" title:NSLocalizedString(@"Release Notes", @"")];
+    }
+
+After your view appears, begin checking for updates. If an update is available, you may present the view controller immediately, as depicted below:
+
+    [self.releaseNotes checkForUpdates:^(BOOL updated) {
+      if (updated) {
+          [self presentViewController:self.releaseNotes animated:YES completion:nil];
+      }
+    }];
+
+Additionally, you could present an alert or some sort of non-modal user interface to the user informing them that they can read release notes if desired.
+
+System Requirements
+====
+
+iOS 9.0 and above. Should be compatible with tvOS, but I haven't tried it there, yet. Supporting iOS 8 should be relatively straightforward, if you're willing to deal with some Auto Layout annoyances that are rendered trivial by `UIStackView`.
+
+Issues, Pull Requests, etc.
+====
+
+Issues, bug fixes, and new features are always welcome. Priority will be given to issues that are accompanied by patches, but I will do my best to stay on top of problems with the code.
+
+Credits
+====
+
+* Created by [Aaron Brethorst](http://www.twitter.com/aaronbrethorst).
+* Inspired by [TWSReleaseNotesView](https://github.com/iGriever/TWSReleaseNotesView), by [Matteo Lallone](https://twitter.com/iGriever) and [Gianluca Divisi](https://twitter.com/gianlucadivisi).
 
 MIT License
 ====