Update README and add CHANGELOG

CHANGELOG.md

@@ -0,0 +1,9 @@
+## v2.0.0
+- updated for iOS7 (overlay is a translucent blur like `UIAlertView`)
+- transitioned to ARC
+- did unholy amounts of refactoring
+- changed superclass to `UIControl` so target/action pattern can be used
+- removed `delegate` which is now redundant thanks to target/action
+- removed custom property `isOn`, use standard `selected` property now
+
+## v1.0.0

README.md

@@ -57,6 +57,29 @@ button.toggleOffBlock = ^(NKToggleOverlayButton *button) {
 };
 ```
 
+You can query the button's current state using 
+
+``` objective-c
+button.isSelected;
+```
+
+You can update the button's state (without displaying the overlay, or triggering `toggleOnBlock`, `toggleOffBlock` or any target/action pairs to be called) using
+``` objective-c
+button.selected = YES;
+```
+This is useful for setting an initial state of the button.
+
+You can programmatically set the button's state and optionally trigger the animated overlay using
+``` objective-c
+[button setSelected:YES animated:YES];
+```
+
+Finally, you can toggle the button's state (switch between on and off), and optionally display the animated overlay using
+``` objective-c
+[button toggleSelectedAnimated:YES];
+```
+
+
 ## Contact
 
 Find me on Twitter [@neilkimmett](http://www.twitter.com/neilkimmett), or drop me an email at neil at kimmett.me