Javascript class missing (#1592)

JavaScript code turns UML classes into function instead of creating class

the syntax for creating a Javacript class is here:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes

eg:

class Point {

   constructor (x, y) {

     this.x = x;

     this.y = y;

   }

note that now Javascript also manages the inheritance that must also be managed