Create swift package

Sources/SideStoreCore/Patreon/Campaign.swift

@@ -0,0 +1,23 @@
+//
+//  Campaign.swift
+//  AltStore
+//
+//  Created by Riley Testut on 8/21/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+extension PatreonAPI {
+    struct CampaignResponse: Decodable {
+        var id: String
+    }
+}
+
+public struct Campaign {
+    public var identifier: String
+
+    init(response: PatreonAPI.CampaignResponse) {
+        identifier = response.id
+    }
+}