Notification Desktop App to work on MAC and Windows

Build a simple order notification app, we have an online shop, we want to get notification each time an order comes in.. there will be a notification table with order id (mysql database). So what the app will do is to always check the table for new orders, once there is a new order play a notification sound loudly till the user click attend to. app should launch when system boot. if a notification is playing user can choose to click on attend then mark as attended_to in db. user should be able to upload/change the notification song that plays which should be mp3, wav or even video of possible.. as it is ringing we can display an animation with the logo and order id from the notification table.