Update README.md

README.md

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 # AXPhotoViewer
-An iPhone/iPad photo gallery viewer, useful for viewing a large number of photos. (WIP)
+AXPhotoViewer is an iOS photo viewer that is useful for viewing a very large (or very small!) amount of images and GIFs. This library supports contextual presentation and dismissal, interactive "flick-to-dismiss" behavior, and easily integrates with many third party async image downloading/caching libraries. 
+
+While AXPhotoViewer has many configurable properties on each of its modules, it is easy to throw down some initialization code and get started:
+
+```swift
+let dataSource = PhotosDataSource(photos: self.photos, prefetchBehavior: .regular)
+let pagingConfig = PagingConfig(navigationOrientation: .horizontal)
+let transitionInfo = TransitionInfo(startingView: self.startinImageView) { [weak self] (photo, index) -> UIImageView? in
+    return self?.endingImageView
+}
+
+let photosViewController = PhotosViewController(dataSource: dataSource, pagingConfig: pagingConfig, transitionInfo: transitionInfo)
+self.present(photosViewController, animated: true, completion: nil)
+```
+