working message rendering

lib/controllers/new_events_controller.dart

@@ -0,0 +1,18 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:flutter_riverpod/flutter_riverpod.dart";
+import "package:nexus/models/event.dart";
+
+class NewEventsController extends Notifier<IList<Event>> {
+  final String roomId;
+  NewEventsController(this.roomId);
+
+  @override
+  IList<Event> build() => const IList.empty();
+
+  void add(IList<Event> newEvents) => state = newEvents;
+
+  static final provider = NotifierProvider.autoDispose
+      .family<NewEventsController, IList<Event>, String>(
+        NewEventsController.new,
+      );
+}