Reorganize AltStore project into UIKit and SwiftUI folders

AltStore/SwiftUI/App/SideStoreUIApp.swift

@@ -0,0 +1,18 @@
+//
+//  SideStoreUIApp.swift
+//  SideStoreUI
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+
+@main
+struct SideStoreUIApp: App {
+    var body: some Scene {
+        WindowGroup {
+            RootView()
+        }
+    }
+}