Create dev.md (#144)

dev.md

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+# Usage Verifier + Wallet App (iOS)
+
+## Packages
+Both apps need several [packages](https://github.com/eu-digital-green-certificates/dgca-verifier-app-ios#documentation) to run properly. Those are already present in the application and need to be up-to-date in order for the app to run. 
+
+### Updating the app's packages
+In XCode run 
+> File > Packages > Update to Latest Package Versions 
+
+If you encounter errors upon building the project, run 
+> File > Packages > Reset Package Caches 
+
+and 
+> Product > Clean Build Folder.
+
+## Changing the apps configuration
+The apps can be configured to talk to endpoints sepearetely defined in a file called _context.json_. This file can be found in the file explorer under:
+> dgca-verifier-app-ios > context > Release/Test > _context.json_
+
+_Release_ is the context file used when building for production.
+
+_Test_ is the context file used when building for testing.
+
+## Signing the application
+Please use your own enterprise Apple Developer Account for signing.
+
+## Where do I find the latest version?
+#### Verifier App:
+>       Branch: feature/multy-type-certificate
+>       Commit: ffec1 
+#### Wallet App:
+>       Branch: feat/smart-health-cards
+>       Commit: d6d9e8