User verification: Create UserEncryptionTrustLevel enum.

Riot/Modules/Room/Members/Detail/UserEncryptionTrustLevel.h

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+/*
+ Copyright 2020 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;
+
+/**
+ UserEncryptionTrustLevel represents the user trust level in an encrypted room.
+ */
+typedef NS_ENUM(NSUInteger, UserEncryptionTrustLevel) {
+    UserEncryptionTrustLevelTrusted,
+    UserEncryptionTrustLevelWarning,
+    UserEncryptionTrustLevelNormal,
+    UserEncryptionTrustLevelNone,
+    UserEncryptionTrustLevelUnknown
+};