kaizen: add swift section in readme

Author: hakonk

README.md

@@ -288,50 +288,22 @@ instruction). Thus, implement the following method from `UIApplicationDelegate`
 
 #### Integration of the library with a Swift iOS project
 
-Until a better solution is available, we must use `react-native-app-auth` as a Static Library. This is due to the fact that the library is calling `AppDelegate.swift`.
-
-1. Unlink `react-native-app-auth` from your projects `Libraries/`.
-
-2. Manually copy the `RNAppAuth.h` and `RNAppAuth.m` files from the library folder in your `node_modules/` into your project folder.
-
-3. In `RNAppAuth.m` add a new import:
-    ```Objective-C
-    #import "<YouProjectName>-Swift.h"
-    ```
-
-4. In your project's `AppDelegate.swift`, expose your function to `Objective-C` by annotating the AppDelegate with:
-    ```Swift
-    @objc(AppDelegate)
-    ```
-
-5. Add the following code just after the class declaration:
-    ```Swift
-    var currentAuthorizationFlow: OIDAuthorizationFlowSession?
-    ```
-
-6. At the bottom of your class add the following code:
-
-    ```Swift
-    func application(
+The approach mentioned above should also be possible to employ with Swift. In this case one shoule have to import `RNAppAuth`
+and make `AppDelegate` conform to `RNAppAuthAuthorizationFlowManager`. `AppDelegate` should look something like this:
+
+```swift
+@import RNAppAuth
+class AppDelegate: UIApplicationDelegate, RNAppAuthAuthorizationFlowManager {
+  private var currentAuthorizationFlow: OIDAuthorizationFlowSession?
+  func application(
       _ app: UIApplication,
       open url: URL,
       options: [UIApplicationOpenURLOptionsKey: Any] = [:]) -> Bool {
-
-      if currentAuthorizationFlow!.resumeAuthorizationFlow(with: url){
-        currentAuthorizationFlow = nil
-        return true
-      }
-
-      return false;
-    }
-    ```
-    This is a translation of the following `Objective-C` code provided [above](#add-a-current-authorization-session)
-
-**Warning:**
-
-You may need to perform Step 4 and compile your project so that the hidden bridging header file is created. If this file is not created and you follow the rest of the steps then you may fall into a chicken before the egg problem where the project is failing to build because of the missing header file and the header file won't be created because the build is failing.
-
-
+      defer { currentAuthorizationFlow = nil }
+      return currentAuthorizationFlow?.resumeAuthorizationFlow(with: url) ?? false
+  }
+}
+```
 
 ### Android Setup