added Testflight link to index

app/_index.md

@@ -19,3 +19,12 @@ To add the repository, open F-Droid, go to Settings -> Repositories -> +.
 
 [Link](https://fdroid.gitlab.io/ccc/)
 [![https://fdroid.gitlab.io/ccc/](https://fdroid.gitlab.io/ccc/icon.png)](https://fdroid.gitlab.io/ccc/)
+
+
+# iOS Testflight builds
+
+**[https://testflight.apple.com/join/oqZhY70M](https://testflight.apple.com/join/oqZhY70M)**
+
+ ⚠️ Please note ⚠️ We've got a lot of trouble pairing with the card10. If your want to connect to the card10, follow the instructions on the [development page](developing). 
+
+[![https://testflight.apple.com/join/oqZhY70M](http://api.qrserver.com/v1/create-qr-code/?color=000000&bgcolor=FFFFFF&data=https%3A%2F%2Ftestflight.apple.com%2Fjoin%2FoqZhY70M&qzone=1&margin=0&size=400x400&ecc=L)](https://testflight.apple.com/join/oqZhY70M)