OOP Intro Exercise 3

Modify Scoreboard
Add a constructor to Scoreboard that accepts two strings:
- the first string should be assigned to homeTeamName
- the second string should be assigned to visitingTeamName
Test your constructor in the Main class by adding another 
Scoreboard object.
Make sure you can still construct a default Scoreboard: 
use a value for default team names such as "Home" and "Visitors"