Add a simple README.md file including three example use cases.

README.md

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+Rearrange
+=========
+
+This module is used for rearranging names.
+Turns "LastName, FirstName" into "FirstName LastName"
+
+##Example
+
+  * Calling 'rearrange_name("Turing, Alan")' will return '"Alan Turing"'
+  * Calling 'rearrange_name("Hopper, Grace M.")' will return '"Grace M. Hopper"'
+  * Calling 'rearrange_name("Voltaire")' will return '"Voltaire"'