Adds VS App Center analytics + crash reporting

Currently tracks install, refresh, and update app events.

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

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#ifndef MS_ENABLE_H
+#define MS_ENABLE_H
+
+#import <Foundation/Foundation.h>
+
+/**
+ * Protocol to define an instance that can be enabled/disabled.
+ */
+@protocol MSEnable <NSObject>
+
+@required
+
+/**
+ * Enable/disable this instance and delete data on disabled state.
+ *
+ * @param isEnabled  A boolean value set to YES to enable the instance or NO to disable it.
+ * @param deleteData A boolean value set to YES to delete data or NO to keep it.
+ */
+- (void)setEnabled:(BOOL)isEnabled andDeleteDataOnDisabled:(BOOL)deleteData;
+
+@end
+
+#endif