Add prerequisites. (#6)

eu-digital-green-certificates · Apr 30, 2021 · e8eb4e7 · e8eb4e7
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diff --git a/README.md b/README.md
@@ -28,7 +28,11 @@ The wallet app provides a user interface to store and manage personal DGCs direc
 
 ### Prerequisites
 
-- [ ] TODO: Describe prerequisites
+- You need a Mac to run Xcode.
+- Xcode 12.4+ is used for our builds. On the Mac App Store, the os requirement lists macOS 11.0+, but it works fine on Catalina as well.
+- To install development apps on physical iPhones, you need an Apple Developer account.
+- Service Endpoints:
+  - To get QR Codes for testing, you might want to check out `https://dgc.a-sit.at/ehn/testsuite`.
 
 ### Build