added mona-lisa picture to the canvas

sketch.js

@@ -1,7 +1,16 @@
-function setup() {
+let img;
-  createCanvas(400, 400);
+
+// Load the image.
+function preload() {
+  img = loadImage('/assets/mona-lisa.jpg');
 }
 
-function draw() {
+function setup() {
-  background(220);
+  createCanvas(400, 400);
+
+  // Display the image.
+  img.resize(0, 400);
+  image(img, 0, 0);
+
+  describe('Mona lisa - by Davincci');
 }