Add async download for older system versions

Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "Resting",
     defaultLocalization: "en",
-    platforms: [.iOS(.v13), .macOS(.v12)],
+    platforms: [.iOS(.v13), .macOS(.v10_15)],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.
         .library(

Sources/Resting/Helpers/URLSession+AsyncDownload.swift

@@ -0,0 +1,33 @@
+//
+//  URLSession+AsyncDownload.swift
+//
+//
+//  Created by Ulaş Sancak on 8.05.2024.
+//
+
+import Foundation
+
+/// A set of extensions for `URLSession` that provide asynchronous download capabilities.
+extension URLSession {
+    /// Asynchronously downloads a file for a given `URLRequest`.
+    ///
+    /// - Parameters:
+    ///  - request: The `URLRequest` to be downloaded.
+    ///  - Returns: A tuple containing the downloaded file's URL and its associated URL response.
+    ///  - Throws: Any errors encountered during the download operation.
+    func download(for request: URLRequest) async throws -> (URL, URLResponse) {
+        return try await withCheckedThrowingContinuation { continuation in
+            downloadTask(with: request) { url, response, error in
+                guard let url, let response else {
+                    if let error {
+                        continuation.resume(throwing: error)
+                    } else {
+                        continuation.resume(throwing: RestingError.unknown)
+                    }
+                    return
+                }
+                continuation.resume(returning: (url, response))
+            }
+        }
+    }
+}