Update README.md

Author: JulianPrieber

README.md

@@ -281,3 +281,5 @@ Thank you for all your efforts!
 - [text editor (user)](https://github.com/ckeditor/ckeditor5)
 - [updater backend](https://github.com/codedge/laravel-selfupdater)
 - [backup backend](https://github.com/spatie/laravel-backup)
+- [Vcard backend](https://github.com/jeroendesloovere/vcard)
+- [QR code backend](https://github.com/Bacon/BaconQrCode)