Add 2 images demo

dolphin = imread('dolphin.png');
bicycle = imread('bicycle.png');

imshow(dolphin);
disp("Dolphin image size:");
disp(size(dolphin));

imshow(bicycle);
disp("Bicycle image size:");
disp(size(bicycle));

summed = dolphin + bicycle;
imshow(summed);

average = dolphin / 2 + bicycle / 2;
imshow(average);

183/2 + 152/2 = 168
(183+152)/2 = 128