Updated README file

Author: oscardemoya

.DS_Store

@@ -21,6 +21,8 @@ An easy to use Image Viewer that is inspired by Facebook
 
 ## Installation
 
+### CocoaPods
+
 Using [cocoapods](https://cocoapods.org)
 
 ```ruby
@@ -34,6 +36,14 @@ pod 'ImageViewer.swift', '~> 3.0'
 pod 'ImageViewer.swift/Fetcher', '~> 3.0'
 ```
 
+### Carthage
+
+[Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks. To integrate Alamofire into your Xcode project using Carthage, specify it in your `Cartfile`:
+
+```ogdl
+github "michaelhenry/ImageViewer.swift" ~> 3.2
+```
+
 ## How to use it
 
 The simplest way to to use this is by using the [imageView.setupImageViewer()](https://github.com/michaelhenry/MHFacebookImageViewer/blob/master/Example/Demo/BasicViewController.swift#L11)