added cargo files

PinePods-0.8.2/mobile/lib/services/download/download_manager.dart

@@ -0,0 +1,27 @@
+// Copyright 2020 Ben Hills and the project contributors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:pinepods_mobile/entities/downloadable.dart';
+
+class DownloadProgress {
+  final String id;
+  final int percentage;
+  final DownloadState status;
+
+  DownloadProgress(
+    this.id,
+    this.percentage,
+    this.status,
+  );
+}
+
+abstract class DownloadManager {
+  Future<String?> enqueueTask(String url, String downloadPath, String fileName);
+
+  Stream<DownloadProgress> get downloadProgress;
+
+  void dispose();
+}