feat: implement router

lib/main.dart

@@ -7,6 +7,18 @@ void main() {
   runApp(const MyApp());
 }
 
+class Router extends NuRouter{
+  @override
+  String get initialRoute => 'home';
+
+  @override
+  List<NuRoute<NuRouter, Object, Object>> get registerRoutes => [
+    HomeRouter(),
+    DetailsRoute()
+  ];
+
+}
+
 class MyApp extends StatelessWidget {
   const MyApp({Key key}) : super(key: key);
 
@@ -18,13 +30,7 @@ class MyApp extends StatelessWidget {
       theme: ThemeData(
         primarySwatch: Colors.blue,
       ),
-      home: Nuvigator.routes(initialRoute: 'home', routes: [
-        NuRouteBuilder(path: 'home', builder: (BuildContext contextNuvigator, __, ___) => HomeScreen(onPressed: (){
-          Nuvigator.of(contextNuvigator).open('details');
-        },), screenType: materialScreenType),
-        NuRouteBuilder(
-            path: 'details', builder: (_, __, ___) => const DetailsScreen(), screenType: materialScreenType)
-      ]),
+      home: Nuvigator(router: Router()),
     );
   }
 

lib/screens/details_screen.dart

@@ -1,4 +1,19 @@
 import 'package:flutter/material.dart';
+import 'package:nuvigator/next.dart';
+
+class DetailsRoute extends NuRoute {
+  @override
+  Widget build(BuildContext context, NuRouteSettings<Object> settings) {
+    return DetailsScreen();
+  }
+
+  @override
+  String get path => 'details';
+
+  @override
+  ScreenType get screenType => materialScreenType;
+
+}
 
 class DetailsScreen extends StatelessWidget {
   const DetailsScreen({Key key}) : super(key: key);

lib/screens/home_screen.dart

@@ -1,4 +1,21 @@
 import 'package:flutter/material.dart';
+import 'package:nuvigator/next.dart';
+
+class HomeRouter extends NuRoute {
+  @override
+  Widget build(BuildContext context, NuRouteSettings<Object> settings) {
+    return HomeScreen(onPressed: (){
+      nuvigator.pushNamed('details');
+    },);
+  }
+
+  @override
+  String get path => 'home';
+
+  @override
+  ScreenType get screenType => materialScreenType;
+
+}
 
 class HomeScreen extends StatelessWidget {
   final Function onPressed;