Function create_rect

create_rect(
    x: number,
    y: number,
    width: number,
    height: number,
    fill?: number,
    alpha?: number,
): GameObject
Create a rectangle object.

0, 0 is located at the top, left hand side.
Parameters
- x: number
  x coordinate of the top, left corner posiiton
- y: number
  y coordinate of the top, left corner position
- width: number
  width of rectangle
- height: number
  height of rectangle
- fill: number = 0
  colour fill, in hext e.g 0xffffff
- alpha: number = 1
  value between 0 and 1 to denote alpha
Returns GameObject
rectangle object