add search fragment

lib/bloc/scoop_search_event.dart

@@ -0,0 +1,17 @@
+part of 'scoop_search_bloc.dart';
+
+abstract class ScoopSearchEvent extends Equatable {
+  const ScoopSearchEvent();
+
+  @override
+  List<Object> get props => [];
+}
+
+class ScoopSearchQueryChanged extends ScoopSearchEvent {
+  final String query;
+
+  const ScoopSearchQueryChanged(this.query);
+
+  @override
+  List<Object> get props => [query];
+}