Listing two newer features in readme

Author: WesCook

readme.md

@@ -18,6 +18,8 @@ Once loaded, this app runs entirely in your browser.  None of your settings are
 - [Group system](https://github.com/WesCook/BacklogBingo/wiki/Groups) to discourage similar categories from generating together
 - [Dynamic categories](https://github.com/WesCook/BacklogBingo/wiki/Dynamic-Categories) for more unique combinations
 - [Game rules](https://github.com/WesCook/BacklogBingo/wiki/Game-Rules) can be customized individually, or chosen as game modes
+- Import and export generated cards
+- Seeded cards, to sync up with friends
 - Light and dark mode support
 - Accessibility for mobile and keyboard navigation
 - Duplicate entry and win detection logic