[App] Integrated the Feed List to the App with coordinators (#16)

This PR contains the work done to implement the integration of the `FeedListViewController` view controller in the `Feed` framework to the `App` target by using coordinators.

Reviewed-on: rock-n-code/app-reviews#16
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Libraries/Coordination/Kit/Sources/Routers/WindowRouter.swift

@@ -14,7 +14,7 @@ public class WindowRouter: Router {
     private let window: UIWindow?
     
     // MARK: Initialisers
-    public init(window: UIWindow?) {
+    public init(_ window: UIWindow?) {
         self.window = window
     }
     
@@ -22,7 +22,7 @@ public class WindowRouter: Router {
     public func present(
         _ viewController: UIViewController,
         animated: Bool,
-        onDismiss: OnDismissClosure?
+        onDismiss: OnDismissClosure? = nil
     ) {
         window?.rootViewController = viewController
         window?.makeKeyAndVisible()