README: add App Store badge

... and bring in line w/ Flathub badge.

Closes #222

README.md

@@ -61,7 +61,8 @@ The roadmap for future developments regarding the project can be found
 
 ### MultiVNC for Desktop
 
-[<img src="https://flathub.org/assets/badges/flathub-badge-i-en.png" width="190px" />](https://flathub.org/apps/details/net.christianbeier.MultiVNC)
+[<img src="https://flathub.org/assets/badges/flathub-badge-i-en.png" height="60" />](https://flathub.org/apps/details/net.christianbeier.MultiVNC)
+[<img src="https://upload.wikimedia.org/wikipedia/commons/3/3c/Download_on_the_App_Store_Badge.svg" height="60" />](https://apps.apple.com/us/app/multivnc/id6738012997)
 
 To get bleeding-edge packages built from the master development branch, navigate to
 [the list of CI runs](https://github.com/bk138/multivnc/actions/workflows/ci.yml),