More README.md files.

Hello_ComplexUniversal/README.md

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+Hello, Complex Universal
+========================
+
+A sample demonstrating how to create universal applications that
+will run on both iPhone and iPad devices, by switching the UI based
+on the UIInterfaceIdiom enum.
+
+This sample differs from the regular Hello, Universal sample in the
+way UI switching is done. Instead of having one controller manage
+two separate views depending on the device in use, we employ two
+different root controllers.

Hello_Universal/README.md

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+Hello, Universal
+================
+
+A sample demonstrating how to create universal applications that
+will run on both iPhone and iPad devices, by switching the UI based
+on the UIInterfaceIdiom enum.

Hello_iPad/README.md

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+Hello iPad
+==========
+
+This is a simple hwllo world application demonstrating how to
+create, configure, and build applications specific to the iPad.