Add chat example

RiotSwiftUI/Modules/Template/TemplateAdvancedRoomsExample/TemplateRoomList/Service/MatrixSDK/TemplateRoomListService.swift

@@ -0,0 +1,52 @@
+// 
+// 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 TemplateRoomListService: TemplateRoomListServiceProtocol {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let session: MXSession
+    private var listenerReference: Any?
+    
+    // MARK: Public
+    private(set) var roomsSubject: CurrentValueSubject<[TemplateRoomListRoom], Never>
+    
+    // MARK: - Setup
+    
+    init(session: MXSession) {
+        self.session = session
+        self.roomsSubject = CurrentValueSubject(session.rooms.map(TemplateRoomListRoom.init(mxRoom:)))
+//        self.listenerReference = setupPresenceListener()
+    }
+
+    deinit {
+//        guard let reference = listenerReference else { return }
+    }
+
+}
+
+fileprivate extension TemplateRoomListRoom {
+    
+    init(mxRoom: MXRoom) {
+        TemplateRoomListRoom(id: mxRoom.roomId, avatar: mxRoom.summary.avatar, displayName: mxRoom.summary.displayname)
+    }
+}