Add a simple README.md file including a example use case

README.md

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+Rearrange
+=========
+
+This module is used for rearranging names.
+Turns "LastName, FirstName" into "FirstName LastName".
+
+## Examples
+
+ * 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"`