added README.md

Author: nathangitter

README.md

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+# interactive-animations
+
+This project is an example of how to use `UIViewPropertyAnimator` to create interactive animations.
+This was originally created as a demo to accompany I talk I gave at an Austin iOS developer meetup in September, 2017.
+
+The repository's commits are structured in a way to show the various phases of building the animation.
+In the original talk, I would jump between commits to gradually introduce concepts.
+
+The animation is inspired by a WWDC 2017 presentation titled "Advanced Animations with UIKit".
+https://developer.apple.com/videos/play/wwdc2017/230/