Complete the class, named Rectangle,
that creates a new rectangle, given the integer height *(h)*
and width *(w)* of the rectangle. This means that the constructor
has two parameters.

Recall that a square is a special case of a rectangle, with its height equal to its width. Hence, a square can be constructed as a Rectangle, with only a single parameter. This is a case of overloading the constructor, by having two constructor methods, each with different parameters than the other.

Besides the constructors, this class should include a method named
perimeter,
to compute the perimeter of the rectangle *(2 x width + 2 x height)*,
as well as a method named area
to compute the area of the rectangle *(width x height)*.