iOS specific documentation

This should provide some help for iOS developers to integrate the wallet SDK. Since it is a KMP (Kotlin Multiplatform) framework some things have to be addressed a little bit different than usual with a swift only framework. To address this and give some support for a smooth integration some description and examples are provided here.

The above implementation documentation uses the kmp wallet sdk directly and will provide source code examples for it’s usage in swift syntax. An additional way is to use the ios-wallet-sdk swift wrapper that does abstract the SDK further by providing some services to use in the application. This is a separate topic.