Resigns + installs test app to connected devices

AltServer/Devices/ALTDeviceManager.h

@@ -0,0 +1,34 @@
+//
+//  ALTDeviceManager.h
+//  AltServer
+//
+//  Created by Riley Testut on 5/24/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <AltSign/AltSign.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+extern NSErrorDomain const ALTDeviceErrorDomain;
+
+typedef NS_ERROR_ENUM(ALTDeviceErrorDomain, ALTDeviceError)
+{
+    ALTDeviceErrorUnknown,
+    ALTDeviceErrorNotConnected,
+    ALTDeviceErrorConnectionFailed,
+    ALTDeviceErrorWriteFailed,
+};
+
+@interface ALTDeviceManager : NSObject
+
+@property (class, nonatomic, readonly) ALTDeviceManager *sharedManager;
+
+@property (nonatomic, readonly) NSArray<ALTDevice *> *connectedDevices;
+
+- (NSProgress *)installAppAtURL:(NSURL *)fileURL toDevice:(ALTDevice *)altDevice completionHandler:(void (^)(BOOL success, NSError *_Nullable error))completionHandler;
+
+@end
+
+NS_ASSUME_NONNULL_END