fix namespaces and references

src/Api/Core/Router.php

@@ -1,10 +1,11 @@
 <?php
-namespace Core;
+namespace Api\Core;
 
 class Router {
     private $routes = [];
+    private $container;
 
-    public function __construct(\Core\Container $container) {
+    public function __construct(Container $container) {
         $this->container = $container;
     }