Adds VS App Center analytics + crash reporting

Currently tracks install, refresh, and update app events.

Pods/AppCenter/AppCenter-SDK-Apple/iOS/AppCenter.framework/Headers/MSWrapperLogger.h

@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#import <Foundation/Foundation.h>
+
+#import "MSConstants.h"
+
+/**
+ * This is a utility for producing App Center style log messages. It is only intended for use by App Center services and wrapper SDKs of App
+ * Center.
+ */
+@interface MSWrapperLogger : NSObject
+
++ (void)MSWrapperLog:(MSLogMessageProvider)message tag:(NSString *)tag level:(MSLogLevel)level;
+
+@end