[AltServer] Presents info notification on first launch

AltServer/AppDelegate.swift

@@ -46,6 +46,18 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         self.statusItem = item
         
         self.connectedDevicesMenu.delegate = self
+        
+        if !UserDefaults.standard.didPresentInitialNotification
+        {
+            let content = UNMutableNotificationContent()
+            content.title = NSLocalizedString("AltServer Running", comment: "")
+            content.body = NSLocalizedString("AltServer runs in the background as a menu bar app listening for AltStore.", comment: "")
+            
+            let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: nil)
+            UNUserNotificationCenter.current().add(request)
+            
+            UserDefaults.standard.didPresentInitialNotification = true
+        }
     }
 
     func applicationWillTerminate(_ aNotification: Notification)

AltServer/Extensions/UserDefaults+AltServer.swift

@@ -19,6 +19,15 @@ extension UserDefaults
         }
     }
     
+    var didPresentInitialNotification: Bool {
+        get {
+            return self.bool(forKey: "didPresentInitialNotification")
+        }
+        set {
+            self.set(newValue, forKey: "didPresentInitialNotification")
+        }
+    }
+    
     func registerDefaults()
     {
         if self.serverID == nil