add image to canvas code example

Example 1: js image on canvas

base_image = new Image();
base_image.src = 'img/base.png';
base_image.onload = () => ctx.drawImage(base_image, 0, 0);

Example 2: js canvas draw image

ctx.drawImage(image, x, y) // top left coords
ctx.drawImage(image, x, y, width, height) // scaled