Reorganized the Sample app target into folders and also, extracted the ContentViewModel view model from the ContentView view.

Apps/Attendi/App/AttendiApp.swift

@@ -0,0 +1,19 @@
+import SwiftUI
+
+/// The entry point of the Attendi sample app.
+///
+/// The app showcases the Recording feature of the `Features` package, attached to its real audio services: it records audio from the
+/// device's microphone, transcribes the recording into text on device, and presents the result in a modal sheet.
+@main
+struct AttendiApp: App {
+
+    // MARK: Body
+
+    /// The content of the app: a single window group showing the ``ContentView``.
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+    
+}