Add Async image loading

Examples/Time Travel/SwiftUITimeTravel/ContentView.swift

@@ -0,0 +1,17 @@
+import SwiftUI
+
+struct ContentView : View {
+    var body: some View {
+        TimeTravelView(initialState: TodoState()) {
+            TodoListView()
+        }
+    }
+}
+
+#if DEBUG
+struct ContentView_Previews : PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}
+#endif