added simple search feature

lib/widgets/search_widgets/search_bar_widget.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+
+class SearchBarWidget extends StatelessWidget {
+  const SearchBarWidget({super.key, required this.onEditingComplete});
+
+  final Function(String searchString) onEditingComplete;
+
+  @override
+  Widget build(BuildContext context) {
+    TextEditingController searchBarController = TextEditingController();
+    return TextField(
+      controller: searchBarController,
+      onEditingComplete: () => onEditingComplete(searchBarController.text),
+    );
+  }
+}