Added license, platform and twitter handle badges to the README.

README.md

@@ -2,7 +2,10 @@
 
 [![Build Status](https://travis-ci.org/Alamofire/Alamofire.svg)](https://travis-ci.org/Alamofire/Alamofire)
 [![Cocoapods Compatible](https://img.shields.io/cocoapods/v/Alamofire.svg)](https://img.shields.io/cocoapods/v/Alamofire.svg)
-[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+[![Carthage Compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+[![License](https://img.shields.io/cocoapods/l/Alamofire.svg?style=flat&color=gray)](http://cocoadocs.org/docsets/Alamofire)
+[![Platform](https://img.shields.io/cocoapods/p/Alamofire.svg?style=flat)](http://cocoadocs.org/docsets/Alamofire)
+[![Twitter](https://img.shields.io/badge/twitter-@AlamofireSF-blue.svg?style=flat)](http://twitter.com/AlamofireSF)
 
 Alamofire is an HTTP networking library written in Swift.