Project inicialization and base configuration

lib/base.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/material.dart';
+import 'package:animations/animations.dart';
+
+import 'package:adguard_home_manager/widgets/bottom_nav_bar.dart';
+import 'package:flutter/services.dart';
+
+class Base extends StatefulWidget {
+  const Base({Key? key}) : super(key: key);
+
+  @override
+  State<Base> createState() => _BaseState();
+}
+
+class _BaseState extends State<Base> {
+  int selectedScreen = 0;
+
+  @override
+  Widget build(BuildContext context) {
+    return AnnotatedRegion<SystemUiOverlayStyle>(
+      value: SystemUiOverlayStyle(
+        statusBarColor: Colors.transparent,
+        statusBarBrightness: Theme.of(context).brightness == Brightness.light
+          ? Brightness.light
+          : Brightness.dark,
+        statusBarIconBrightness: Theme.of(context).brightness == Brightness.light
+          ? Brightness.dark
+          : Brightness.light,
+        systemNavigationBarColor: Theme.of(context).scaffoldBackgroundColor,
+        systemNavigationBarIconBrightness: Theme.of(context).brightness == Brightness.light
+          ? Brightness.dark
+          : Brightness.light,
+      ),
+      child: Scaffold(
+        body: PageTransitionSwitcher(
+          duration: const Duration(milliseconds: 200),
+          transitionBuilder: (
+            (child, primaryAnimation, secondaryAnimation) => FadeThroughTransition(
+              animation: primaryAnimation, 
+              secondaryAnimation: secondaryAnimation,
+              child: child,
+            )
+          ),
+        ),
+        bottomNavigationBar: BottomNavBar(
+          selectedScreen: selectedScreen,
+          onSelect: (value) => setState(() => selectedScreen = value),
+        ),
+      ),
+    );
+  }
+}