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

README.md

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+Rearrange
+=========
+
+This module is used for rearrange 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"`
+