Created project base structure, state management, router and login

lib/widgets/layout.dart

@@ -0,0 +1,52 @@
+import 'package:animations/animations.dart';
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+
+class Layout extends StatelessWidget {
+  final StatefulNavigationShell navigationShell;
+
+  const Layout({
+    Key? key,
+    required this.navigationShell,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    void goBranch(int index) {
+      navigationShell.goBranch(
+        index,
+        initialLocation: index == navigationShell.currentIndex,
+      );
+    }
+
+    return Scaffold(
+      body: PageTransitionSwitcher(
+        duration: const Duration(milliseconds: 200),
+        transitionBuilder: (child, primaryAnimation, secondaryAnimation) => FadeThroughTransition(
+          animation: primaryAnimation,
+          secondaryAnimation: secondaryAnimation,
+          child: child,
+        ),
+        child: navigationShell,
+      ),
+      bottomNavigationBar: NavigationBar(
+        onDestinationSelected: (s) => goBranch(s),
+        selectedIndex: navigationShell.currentIndex,
+        destinations: const [
+          NavigationDestination(
+            icon: Icon(Icons.link_rounded),
+            label: "Links",
+          ),
+          NavigationDestination(
+            icon: Icon(Icons.search_rounded),
+            label: "Search",
+          ),
+          NavigationDestination(
+            icon: Icon(Icons.settings_rounded),
+            label: "Settings",
+          ),
+        ],
+      ),
+    );
+  }
+}