Room Widget Permission: Create room widget permission screen.

Riot/Modules/Integrations/WidgetPermission/WidgetPermissionViewModel.swift

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+/*
+ Copyright 2019 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
+
+/// View model used by `WidgetPermissionViewController`
+@objcMembers
+final class WidgetPermissionViewModel: NSObject {
+    
+    let creatorUserId: String
+    let creatorDisplayName: String?
+    let creatorAvatarUrl: String?
+    let widgetDomain: String?
+    let mediaManager: MXMediaManager
+    
+    init(creatorUserId: String, creatorDisplayName: String?, creatorAvatarUrl: String?, widgetDomain: String?, mediaManager: MXMediaManager) {
+        self.creatorUserId = creatorUserId
+        self.creatorDisplayName = creatorDisplayName
+        self.creatorAvatarUrl = creatorAvatarUrl
+        self.widgetDomain = widgetDomain
+        self.mediaManager = mediaManager
+    }    
+}