README: A very short, High-Level introductory statement.

[cdflynn]

This should be the first thing people see, and in a few lines show exactly what they’re going to get with sealed-enum . It should be immediately followed by the existing problem statement documentation and deeper details about what is generated.
ala,

Sealed Enum

Automatically add enum methods to your sealed classes:

YourSealedClass.values() : List<YourSealedClass>