Create managers folder

Riot/Managers/Analytics/DecryptionFailure.h

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+/*
+ Copyright 2018 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/Foundation.h>
+
+/**
+ Failure reasons as defined in https://docs.google.com/document/d/1es7cTCeJEXXfRCTRgZerAM2Wg5ZerHjvlpfTW-gsOfI.
+ */
+struct DecryptionFailureReasonStruct
+{
+    __unsafe_unretained NSString * const unspecified;
+    __unsafe_unretained NSString * const olmKeysNotSent;
+    __unsafe_unretained NSString * const olmIndexError;
+    __unsafe_unretained NSString * const unexpected;
+};
+extern const struct DecryptionFailureReasonStruct DecryptionFailureReason;
+
+/**
+ `DecryptionFailure` represents a decryption failure.
+ */
+@interface DecryptionFailure : NSObject
+
+/**
+ The id of the event that was unabled to decrypt.
+ */
+@property (nonatomic) NSString *failedEventId;
+
+/**
+ The time the failure has been reported.
+ */
+@property (nonatomic, readonly) NSTimeInterval ts;
+
+/**
+ Decryption failure reason.
+ */
+@property (nonatomic) NSString *reason;
+
+@end