criada a tela attendance_list_screen.dart, about_screen.dart e main_procedures_screen.dart

lib/widgets/appbar_default.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+import 'package:rkm/widgets/alert_dialog_settings.dart';
+import '../utils/color_palette.dart';
+import 'icon_button_default.dart';
+
+class AppBarDefault{
+
+  @override
+  PreferredSize appbar(BuildContext context,String title) {
+    return PreferredSize(
+        preferredSize: Size.fromHeight(50),
+        child: AppBar(
+        title: Text(title),
+        centerTitle: true,
+        actions: [
+          IconButtonDefault(
+              icon: Icons.settings,
+              color: ColorPalette.white,
+              onPressed: ()=>AlertDialogSettings().alert(context)
+          ),
+          IconButtonDefault(
+            icon: Icons.logout,
+            color: ColorPalette.white,
+            onPressed: ()=>Navigator.pushNamedAndRemoveUntil(context, '/login',(Route<dynamic> route) => false)),
+        ],
+      ),
+    );
+  }
+}