added new pages

lib/pages/dashboard_page.dart

@@ -20,6 +20,10 @@ class _DashboardPageState extends State<DashboardPage> {
         future: checklistFuture,
         builder: _futureBuilder,
       ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _onAddTapped,
+        child: const Icon(Icons.add),
+      ),
     );
   }
 
@@ -43,4 +47,8 @@ class _DashboardPageState extends State<DashboardPage> {
       subtitle: Text(cl.description),
     );
   }
+
+  void _onAddTapped() {
+    DbHelper.addChecklist().then((id) {});
+  }
 }

lib/pages/detail_checklist_page.dart

@@ -0,0 +1,10 @@
+import 'package:flutter/material.dart';
+
+class DetailChecklistPage extends StatelessWidget {
+  const DetailChecklistPage({super.key});
+  static const routeName = '/detail';
+  @override
+  Widget build(BuildContext context) {
+    return const Placeholder();
+  }
+}

lib/pages/edit_checklist_page.dart

@@ -0,0 +1,10 @@
+import 'package:flutter/material.dart';
+
+class EditChecklistPage extends StatelessWidget {
+  const EditChecklistPage({super.key});
+  static const routeName = '/edit';
+  @override
+  Widget build(BuildContext context) {
+    return const Placeholder();
+  }
+}