Add separated threads for executing commands and console stuff to prevent blocking issues.

Adding requirements for playing the notification sound such as: PRICE_LOWER_THAN <value>, IN_STOCK, IN_DISCOUNT, etc.
Those requirements should be added through user prompted commands.

Save program state so you don't need to re-add every product on start.
This might be done with a .properties or a .xml file.

Instead of having already set parameters in StockCheckResult.kt, such as productName, price, availability make so it can accept multiple ProductProperty<Type> objects. That object will hold the property name (eg.: price), its value (100.0EUR), and the way it prints it ("GREEN ${price}").

Add a welcoming page to this project and making it public.

Implement unit testing to the majority of features.

PCDIGA displays unavailable shop stock with Por encomenda. In the current version it does not detect it.

Change web scraper to https://github.com/skrapeit/skrape.it so we can make use of Kotlin DSL features.

Add discount property fetcher to compatible websites.

Instead of having 5000ms constant delay on connecting to every website, website parser implementations should be able to change it in order to prevent rate-limiting to some websites.

Make a notification system so that when the product becomes available it sends a notification.
Notifications can be sent through Discord, Email, Sound, Windows Notification, etc.

Make it possible to run on a gui console app. It should be possible to put it on system tray as well.

Accept multiple product links so it could display more than one product at the console. You could add more links through a command add <link>, remove them with remove <index>, and list them with list.
This would also remove the necessity of inserting a link on the program startup and instead display a message saying that he can add or remove products through those commands.

Add command manager to accept other console commands like add <link>, remove <link>, setdelay <delay>.

Be able to grab products from websites searching URLs.

Add support for https://github.com/jline/jline3 to make console management easier.