Update README.md

Adding Gif

Author: jpotts18

README.md

@@ -3,6 +3,8 @@ Swift-Validator
 
 Swift Validator is a rule-based validation library for Swift.
 
+![Swift Validator](https://dl.dropboxusercontent.com/u/18055521/out.gif)
+
 ## Core Concepts
 
 * ```UITextField``` + ```ValidationRule``` go into  ```Validator```