add interfaces for route and route collection

src/Routing/RouteCollection.php

@@ -1,8 +1,10 @@
 <?php namespace SokoWeb\Routing;
 
 use Closure;
+use SokoWeb\Interfaces\Routing\IRoute;
+use SokoWeb\Interfaces\Routing\IRouteCollection;
 
-class RouteCollection
+class RouteCollection implements IRouteCollection
 {
     private array $routes = [];
 
@@ -32,7 +34,7 @@ class RouteCollection
         array_pop($this->groupStack);
     }
 
-    public function getRoute(string $id): ?Route
+    public function getRoute(string $id): ?IRoute
     {
         if (!isset($this->routes[$id])) {
             return null;