Add Simple Template Example

- Add a simple Template example that shows a user profile with avatar, displayName and presence.
- ScreenCoordinator: closure based with less protocols and delegates.
- Reducer: Reducer function that manages all state modifications.
- SwiftUI View: Decomposes UI into appropriate sub components.
- Uses Theme and Dependency Management Infrastructure

RiotSwiftUI/Modules/Template/SimpleProfileExample/Service/Mock/MockTemplateUserService.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
+import Combine
+
+@available(iOS 14.0, *)
+class MockTemplateUserService: TemplateUserServiceType, ObservableObject {
+
+    static let example = MockTemplateUserService()
+    @Published var presence: TemplatePresence = .online
+    var presencePublisher: AnyPublisher<TemplatePresence, Never> {
+        $presence.eraseToAnyPublisher()
+    }
+    let userId: String = "123"
+    let displayName: String? = "Alice"
+    let avatarUrl: String? = "mx123@matrix.com"
+    let currentlyActive: Bool = true
+    let lastActive: UInt = 1630596918513
+}