Restructured the Sample app target in the Xcode project and added its unit tests target as well.

Apps/Attendi/Sources/App/AttendiApp.swift

@@ -0,0 +1,21 @@
+import SwiftUI
+
+/// The entry point of the Attendi sample app.
+///
+/// The app is a thin shell over the `Features` package. It showcases the Recording feature attached to its real audio services —
+/// recording audio from the device's microphone, transcribing it on device in a locale picked from a toolbar menu, and presenting
+/// the result in a modal sheet — while the speech model assets of every picked locale preinstall in the background, with their
+/// download events reported through the Notifying feature's transient in-app notifications.
+@main
+struct AttendiApp: App {
+
+    // MARK: Body
+
+    /// The content of the app: a single window group showing the ``ContentView``.
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+
+}