unused helper
create base validation exception class
-Remove Factory method;
-Make Sex type for sex (was boolean);
-Make validation exceptions as inner static classes;
-Inherit exceptions from ValidationException;
-Make Human - domain model;
-Make console application for entering 'padawan';
-Make console application view-model :
   1.Add Human domain model - HumanViewModel as a Stream access way interface;
   2.Make it through passing input and output stream;
   3.Add operations which can manipulate humman via stream
add some util
add TODO))