Update app/_index.md, app/developing.md files

app/_index.md

+---
+title: Companion App
+---
+
+<div class="p-notification--caution">
+    <p class="p-notification__response">
+        <span class="p-notification__status">Warning:</span>
+        We are still in developing the Companion App for iOS and Android
+    </p>
+</div>
+
+## We need really help, please follow us [here](developing)
\ No newline at end of file

app/developing.md

 ---
-title: Companion App
+title: Developing
 ---
 
+Here is the source:
+- [git.card10.badge.events.ccc.de/card10/companion-app-android](https://git.card10.badge.events.ccc.de/card10/companion-app-android/)
+- [git.card10.badge.events.ccc.de/card10/companion-app-ios](https://git.card10.badge.events.ccc.de/card10/companion-app-ios/)
+
+
+### Android / F-Droid nightly
+The GitLab delivere a (unsafe) Android Debug Build of Companion App by a F-Droid repository.
+If you are able to create debug logs and create Issues feel free to subscribe this repository.
+
+
+[![https://git.card10.badge.events.ccc.de/card10/companion-app-android-nightly/raw/master/fdroid/repo](https://git.card10.badge.events.ccc.de/card10/companion-app-android-nightly/raw/master/icon.png)](https://git.card10.badge.events.ccc.de/card10/companion-app-android-nightly/raw/master/fdroid/repo)
+
 
-<div class="p-notification--caution">
-    <p class="p-notification__response">
-        <span class="p-notification__status">Warning:</span>
-        We are still in developing the Companion App for iOS and Android
-    </p>
-</div>
\ No newline at end of file