Because of the time limitation, I couldn't finish the config part of
the application (Connecting to MySQL using a form)
Please, add your MySQL configuration manually in the public/server/config/Database.php file
and import "items.sql" file to your database.
Please run "npm run build" and open the directory "build/" in your server to see the result
Upload an image: Press on the SPACE key
Create a rectangle: Click on the screen
Resize an item: Use resizers