[Framework] Feed item filtering in the Feed List view (#11)

This PR contains the work done to implement the filtering of the items shown in the `FeedListViewController` view controller by star rating.

Reviewed-on: rock-n-code/app-reviews#11
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/AppDelegate.swift

@@ -1,6 +1,6 @@
 //
 //  AppDelegate.swift
-//  AppStoreReviews
+//  ReviewsApp
 //
 //  Created by Dmitrii Ivanov on 21/07/2020.
 //  Copyright © 2020 ING. All rights reserved.
@@ -10,16 +10,27 @@ import ReviewsFeed
 import UIKit
 
 @UIApplicationMain
-class AppDelegate: UIResponder, UIApplicationDelegate {
+class AppDelegate: UIResponder {
     
+    // MARK: Properties
     var window: UIWindow?
-
-    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
-        window = UIWindow(frame: UIScreen.main.bounds)
-        let viewController = FeedListViewController()
-        window?.rootViewController = UINavigationController(rootViewController: viewController)
-        window?.makeKeyAndVisible()
-        return true
-    }
+    
 }
 
+// MARK: - UIApplicationDelegate
+extension AppDelegate: UIApplicationDelegate {
+    
+    // MARK: Functions
+    func application(
+        _ application: UIApplication,
+        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+    ) -> Bool {
+        window = UIWindow(frame: UIScreen.main.bounds)
+        
+        window?.rootViewController = UINavigationController(rootViewController: FeedListViewController())
+        window?.makeKeyAndVisible()
+        
+        return true
+    }
+    
+}