Add a simple screen SwiftUI template.

RiotSwiftUI/Modules/Template/SimpleScreenExample/TemplateSimpleScreenModels.swift

@@ -0,0 +1,71 @@
+// 
+// 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
+
+enum TemplateSimpleScreenPromptType {
+    case regular
+    case upgrade
+}
+
+extension TemplateSimpleScreenPromptType: Identifiable, CaseIterable {
+    var id: Self { self }
+    
+    var title: String {
+        switch self {
+        case .regular:
+            return "Enable this feature?"
+        case .upgrade:
+            return "Upgrade this feature?"
+        }
+    }
+    
+    var imageName: String {
+        switch self {
+        case .regular:
+            return "person.circle"
+        case .upgrade:
+            return "arrowshape.zigzag.forward"
+        }
+    }
+}
+
+// MARK: View model
+
+enum TemplateSimpleScreenStateAction {
+    case viewAction(TemplateSimpleScreenViewAction)
+}
+
+enum TemplateSimpleScreenViewModelResult {
+    case accept
+    case cancel
+}
+
+// MARK: View
+
+struct TemplateSimpleScreenViewState: BindableState {
+    var promptType: TemplateSimpleScreenPromptType
+    var count: Int
+}
+
+enum TemplateSimpleScreenViewAction {
+    case incrementCount
+    case decrementCount
+    case accept
+    case cancel
+}