Point toString
Modify the toString method in the Point class.
Make it return a string in the following format.
For example, if a Point object stored in a variable pt represents the point (5, -17), return the string:
Point[x=5,y=-17]
If the client code were to call System.out.println(pt); ,
that text would be shown on the console.
(Test your code in Practice-It, or by running your PointClient or PointMain and printing a Point there.)