Prepare onboarding flow for personalisation screens.

Add a BuildSetting to control the display of the personalisation screens.
Add a property to delay the AuthenticationCoordinator from showing any screens.
Add Congratulations screen to onboarding flow.

RiotSwiftUI/Modules/Onboarding/Congratulations/OnboardingCongratulationsViewModel.swift

@@ -0,0 +1,50 @@
+//
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import SwiftUI
+
+@available(iOS 14, *)
+typealias OnboardingCongratulationsViewModelType = StateStoreViewModel<OnboardingCongratulationsViewState,
+                                                                  Never,
+                                                                  OnboardingCongratulationsViewAction>
+@available(iOS 14, *)
+class OnboardingCongratulationsViewModel: OnboardingCongratulationsViewModelType, OnboardingCongratulationsViewModelProtocol {
+
+    // MARK: - Properties
+
+    // MARK: Private
+
+    // MARK: Public
+
+    var completion: ((OnboardingCongratulationsViewModelResult) -> Void)?
+
+    // MARK: - Setup
+
+    init(userId: String, initialCount: Int = 0) {
+        super.init(initialViewState: OnboardingCongratulationsViewState(userId: userId))
+    }
+
+    // MARK: - Public
+
+    override func process(viewAction: OnboardingCongratulationsViewAction) {
+        switch viewAction {
+        case .personaliseProfile:
+            completion?(.personaliseProfile)
+        case .takeMeHome:
+            completion?(.takeMeHome)
+        }
+    }
+}