Add to Reading List with Notifications

Enables adding/removing links from the reading list as well as marking them as read/unread. You can use keyboard shortcuts (default settings are Ctrl +D for save/remove and Ctrl+Shift+D for mark read/unread) or you can click on the extension icon and use the buttons there to easily access the same functions. Each action will register a notification/confirmation to let you know what has changed. Fairly simple at the moment, though let me know if you see any bugs or want to make changes and I'll work on making updates :)