added prototype of the filter bar + all quotes count

frontend/lib/provider/quote_provider.dart

@@ -18,6 +18,12 @@ class QuoteProvider extends ChangeNotifier {
 
   final QuoteRepository repo = QuoteRepository();
 
+  var filterController = TextEditingController(text: '');
+
+  void clearFilterController() {
+    filterController.text = '';
+  }
+
   QuoteProvider() {
     readQuotes(); // auto-load on creation
   }