Wrote basic README file

README.md

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+# AHAlertView
+
+## Overview
+
+`AHAlertView` is a powerful, block-based alternative to UIKit's `UIAlertView`. It has the following attractive features:
+
+ 1. Block-based button events - no more messy delegate code
+ 2. `UIAppearance` conformance to allow easy skinning of all elements
+ 3. Additional presentation and dismissal animations (tumble, fade, zoom, etc.)
+
+Showing an alert is as simple as creating an alert, adding a button, and showing the alert:
+
+    AHAlertView *alert = [[AHAlertView alloc] initWithTitle:@"Hello, World!" message:@"I'm an alert view!"];
+    [alert setCancelButtonTitle:@"Dismiss" block:nil];
+    [alert show];
+
+You can use the block you pass in with the button title to perform any action, including setting a custom dismissal animation based on which button was touched:
+
+    [alert setCancelButtonTitle:@"Cancel" block:^{
+	    alert.dismissalStyle = AHAlertViewDismissalStyleTumble;
+    }];
+
+## TODO
+
+ - Currently, only the default style (title and message) is available. Styles with text fields or an activity indicator are planned.
+ - The layout code is monolithic and inflexible. It needs to be cleaned up.
+ - I think we can all agree a little more documentation would be nice.