Add top level readme file

README.md

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+= Cyface iOS SDK
+
+This reposiory contains the Cyface SDK for iOS. 
+It encompasses three projects. 
+One is the [actual SDK](https://github.com/cyface-de/ios-backend/tree/main/DataCapturing) while and the other are two example applications.
+The two example applications are:
+
+1. *[The Cyface App](https://github.com/cyface-de/ios-backend/tree/main/Cyface-App):* This is the main app showing the base functionality of the Cyface SDK. 
+It is available from the [App Store](https://apps.apple.com/de/app/cyface/id1456291958).
+2. *[The Ready for Robots App](https://github.com/cyface-de/ios-backend/tree/main/RFR-App):* This is an application developed as part of the [Ready for Robots Research project](https://ready-for-robots.de/).
+The project is funded by the German ministry of traffic and digital infrastructure.
+It is available from the [App Store](https://apps.apple.com/de/app/rfr/id1669106993).