Update README with link to iOS version

You guys mentioned you wanted an iOS version of the app and since you chose to stick with the native route, I got started on [Fresh-Fridge-ios](https://github.com/jacks205/Fresh-Fridge-ios). 


I decided to develop with Swift, but anyone that knows Objective-C or libraries that are in Objective-C are super easy to integrate. I will commit a wireframe of the app flow tonight that looks like [yours](https://raw.githubusercontent.com/coron108/Fresh-Fridge/master/images/appScreens.jpg), but it will be ugly for now. I will go back and try to redesign while sticking to the [iOS Design Guidelines ](https://developer.apple.com/library/ios/documentation/userexperience/conceptual/mobilehig/). 


If you guys had access to a Mac and wanted to start fully working on this yourselves and don't know Swift/Obj-C, I can help you or refer you to some great tutorials/sites that helped me.

Let me know what you think!