Created onboarding

lib/screens/onboarding/provider/onboarding.provider.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+import 'package:my_linkding/screens/onboarding/model/onboarding.model.dart';
+
+part 'onboarding.provider.g.dart';
+
+@riverpod
+class Onboarding extends _$Onboarding {
+  @override
+  OnboardingModel build() {
+    return OnboardingModel(
+      pageController: PageController(),
+      confirmServerRunning: false,
+    );
+  }
+
+  void nextPage() {
+    state.pageController.nextPage(
+      duration: const Duration(milliseconds: 200),
+      curve: Curves.ease,
+    );
+  }
+
+  void previousPage() {
+    state.pageController.previousPage(
+      duration: const Duration(milliseconds: 200),
+      curve: Curves.ease,
+    );
+  }
+
+  void confirmServerRunning() {
+    state = state.toggleConfirmServerRunning(!state.confirmServerRunning);
+  }
+}