Update README.md with instructions about LearnAboutStackViews app

README.md

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 # mastering-auto-layout
+
 This is a repository which contains playgrounds and sample apps for learning about UIStackView's and Auto Layout.
+
+# Learning About Stack Views
+
+This is a sample app which allows the user to explore stack views by experimenting with various parameters, pinning options, and content.
+
+To run:
+
+* Open LearnAboutStackViews/LearnAboutStackViews.xcodeproj in Xcode
+* Set your simulator to one of the iPad simulators
+* Build and Run
+* Click on "Update" in bottom right to adjust parameters
+
+