Added delegate section

Author: Boris-Em

README.md

@@ -21,6 +21,7 @@
 * [**Documentation**](#documentation)
   * [Enabling / Disabling the Checkbox](#enabling--disabling-the-checkbox) 
   * [Reloading](#reloading)
+  * [Delegate] (#delegate)
   * [Customization](#customization)
 
 ## Project Details
@@ -101,6 +102,15 @@ Example usage:
 [self.myCheckBox reload]
 ```
 
+### Delegate
+**BEMCheckBox** uses a delegate to receive check box events. The delegate object must conform to the `BEMCheckBoxDelegate` protocol, which is composed of two optional methods:
+
+- `didTapCheckBox:`  
+Sent to the delegate every time the check box gets tapped, after its properties are updated (on), but before the animations are completed.
+
+- `animationDidStopForCheckBox:`  
+Sent to the delegate every time the check box finishes being animated.
+
 ### Customization
 **BEMCheckBox** is exclusively customizable though properties.  
 The following diagram provides a good overview: