This HashSetUtil class tests various usages of the HashSetUtil class. 
params 1 and 2 are a first name and a last name. You will construct TWO Person
objects, p1 and p2, each with param1 and param2 for their fn and ln respectively. 
You will then construct a HashSet and enter ONLY your p1 into it. Then you will  
search the HashSet using Person p2. This search wil FAIL. You will remedy this
by adding to the Person class an override for the equals and hashcode methods so that 
the search is successful and the return value is true.