Add the Use Case selection screen to the onboarding flow.

RiotSwiftUI/Modules/Onboarding/UseCase/OnboardingUseCaseModels.swift

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+// 
+// 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 Foundation
+
+// MARK: - Coordinator
+
+// MARK: View model
+
+enum OnboardingUseCaseStateAction {
+    case viewAction(OnboardingUseCaseViewAction)
+}
+
+enum OnboardingUseCaseViewModelResult {
+    case personalMessaging
+    case workMessaging
+    case communityMessaging
+    case skipped
+    case customServer
+}
+
+// MARK: View
+
+struct OnboardingUseCaseViewState: BindableState { }
+
+enum OnboardingUseCaseViewAction {
+    case answer(OnboardingUseCaseViewModelResult)
+}