Assignment 4 Initial Files

Initial Files for Assignment 4
Implement methods in Part 1 Assignment 4

Implement height2(Node* s) for Part 1 of Assignment 4 and fix
indentation for size2().
Implement methods for Part 2 Assignment 4

Implement recursive bool isBalanced() and int isBalanced(Node* u)
methods.
Implement fields and methods for Part 3 Assignment 4

Implement pre-order, in-order and post-order fields for BSTNode1.
Implement methods to assign values to these fields.