Rename the readme file to v2.md

Author: JakeLin

README.v2.md

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+Swift Weather
+============
+
+SwiftWeather is an iOS weather app developed in Swift language. The app can support iPhone 4(s), iPhone 5(s), iPhone 6 and iPhone 6 Plus. The app also supports Today Widgets.
+
+## Notices
+The current version is working with Xcode Version 6.3 (6D570) and Version 6.3.1 (6D1002), I have been updating the app to support the lastest version of Xcode, if you have any issue, please check the Xcode version. If there is still a problem with the supported versions, please raise an issue, thanks. 
+
+## Version 2
+This is version 2. I have ugraded the entire project to use [Carthage](https://github.com/Carthage/Carthage), [Alamofire](https://github.com/Alamofire/Alamofire) and [SwiftyJSON](https://github.com/SwiftyJSON/SwiftyJSON). And the app can only support iOS8+, if you want to support iOS7 or use CocoaPods and AFNetworking. Please have a look at [README.v1.md](https://github.com/JakeLin/SwiftWeather/blob/master/README.v1.md) and Release [Using Cocoapods and AFNetworking](https://github.com/JakeLin/SwiftWeather/releases/tag/V1). Happy coding.
+
+## Screenshots
+![Loading](https://raw.githubusercontent.com/JakeLin/SwiftWeather/master/screenshots/loading-33.png)
+
+![Loading](https://raw.githubusercontent.com/JakeLin/SwiftWeather/master/screenshots/6-Today-smallsize.png)
+
+![Swift Weather](https://raw.githubusercontent.com/JakeLin/SwiftWeather/master/screenshots/6-smallsize.png)
+
+ 
+## Used features
+* Swift Programming Language
+* [Carthage](https://github.com/Carthage/Carthage)
+* [Alamofire](https://github.com/Alamofire/Alamofire)
+* [SwiftyJSON](https://github.com/SwiftyJSON/SwiftyJSON)
+* Core Location
+* Using Framework to share code between targets(app and widget).
+
+
+## Known issues
+Because we are using [Carthage](https://github.com/Carthage/Carthage) to build the third party packages. There are some build warings like `ld: warning: linking against dylib not safe for use in application extensions: /Build/Products/Debug-iphoneos/Alamofire.framework/Alamofire`
+
+## How to build
+Because the app uses carthage, we need to install carthage. To install the carthage tool on your system, please download and run the Carthage.pkg file for the latest [release](https://github.com/Carthage/Carthage/releases), then follow the on-screen instructions..
+
+1. Open Terminal app.
+2. Change directory to the project folder. `cd $project_dir`
+3. Use `ls` to list all the file to check whether *Cartfile* file is in the folder? 
+4. If the *Cartfile* has been found, then execute `carthage update`.This will fetch dependencies into a Carthage/Checkouts folder, then build each one.
+5. On your application targets’ “General” settings tab, in the “Linked Frameworks and Libraries” section, drag and drop each framework you want to use from the Carthage/Build folder on disk. In our project, which are `Alamofire` and `SwiftyJSON`
+7. Press *Cmd + B* to build the app.
+8. Press *Cmd + R* to run the app on Simulator.
+
+## Credits
+* Thanks to [johnsonjake](https://github.com/johnsonjake) for adding iOS 8 support and improving the UI/UX.
+* Thanks to [Marc](https://github.com/gizmou) for adding forcast feature, widget and app icon.