added technical Overview section, almost done introduction
package Mainclass Point(xc: Int, yc: Int) { var x: Int = xc var y: Int = yc def move(dx: Int, dy: Int) { x = x + dx y = y + dy } override def toString(): String = "(" + x + ", " + y + ")";}object Classes{ def main(args: Array[String]){ val pt = new Point(1,2) println(pt) pt.move(10,10) println(pt) }}