Feature/widget testing (#8)

* Configured iOS Build
* Created ProgressListTile widget
* Created MaterialTesterWidget
* Created String Methods for Testing in ProgressListTile
* Created ProgressListTileStrings class
* Using Progress List Tile
* Created Progress List View
* Created Progress List Tile currently, future and past test.
* Created Progress List View one and five Time Progresses test.

Signed-off-by: Andreas Fahrecker <AndreasFahrecker@gmail.com>

ios/Runner/AppDelegate.swift

@@ -0,0 +1,13 @@
+import UIKit
+import Flutter
+
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}