Add code docs to the navigation controller and associated objects.

Sources/SwiftUICoordinator/Routing/NavigationController/NavigationControllerDelegateProxy.swift

@@ -7,6 +7,13 @@
 
 import SwiftUI
 
+/// A delegate proxy class responsible for managing navigation controller transitions by providing animation controllers.
+///
+/// This class acts as a bridge between the navigation controller and the transition handling process. It delegates
+/// the responsibility of providing animations to the associated `NavigationControllerTransitionHandler`.
+///
+/// - Note: To use this class effectively, ensure that you initialize it with an appropriate
+/// `NavigationControllerTransitionHandler` instance.
 @MainActor
 public class NavigationControllerDelegateProxy: NSObject, UINavigationControllerDelegate {
 

Sources/SwiftUICoordinator/Routing/NavigationController/NavigationControllerFactory.swift

@@ -16,6 +16,7 @@ protocol NavigationControllerCreatable {
  ) -> NavigationController
 }
 
+/// A factory class for creating navigation controllers and their delegates.
 public final class NavigationControllerFactory: NavigationControllerCreatable {
 
  public init() {}

Sources/SwiftUICoordinator/Routing/NavigationController/NavigationControllerTransitionHandler.swift

@@ -10,25 +10,37 @@ import SwiftUI
 @MainActor
 public class NavigationControllerTransitionHandler {
 
+ /// The provider responsible for supplying transitions.
  public let provider: TransitionProvidable
 
  public init(provider: TransitionProvidable) {
  self.provider = provider
  }
 
+ /// Asks the transition handler for an animator object to use when transitioning a view controller on or off the navigation stack.
+ ///
+ /// - Parameters:
+ /// - navigationController: The navigation controller containing the view controllers involved in the transition.
+ /// - operation: The type of transition operation being performed.
+ /// - fromVC: The view controller that is being transitioned from.
+ /// - toVC: The view controller that is being transitioned to.
+ ///
+ /// - Returns: An animator object conforming to `UIViewControllerAnimatedTransitioning`, or nil if no animation is desired.
  func navigationController(
  _ navigationController: UINavigationController,
  animationControllerFor operation: UINavigationController.Operation,
  from fromVC: UIViewController,
  to toVC: UIViewController
  ) -> UIViewControllerAnimatedTransitioning? {
+ // Check if both fromVC and toVC conform to RouteProvider and retrieve their route information.
  guard
  let from = (fromVC as? RouteProvider)?.route,
  let to = (toVC as? RouteProvider)?.route
  else {
  return nil
  }
 
+ // Find the eligible transition from the provider based on the given route and operation.
  if let transition = provider.transitions
  .compactMap({ $0.transition })
  .first(where: { $0.isEligible(from: from, to: to, operation: operation) }) {