First draft of Onboarding page

lib/screens/onboarding/bloc/onboarding_event.dart

@@ -0,0 +1,16 @@
+//part of 'onboarding_bloc.dart';
+
+import 'package:flutter/material.dart';
+
+@immutable
+abstract class OnboardingEvent {}
+
+class PageChangedEvent extends OnboardingEvent {
+
+}
+
+class PageSwipedEvent extends OnboardingEvent {
+  final int index;
+
+  PageSwipedEvent({required this.index});
+}