Add option to not use a download client (#35)

code/Common/Configuration/DownloadClient/DownloadClientConfig.cs

@@ -0,0 +1,9 @@
+using Microsoft.Extensions.Configuration;
+
+namespace Common.Configuration.DownloadClient;
+
+public sealed record DownloadClientConfig
+{
+    [ConfigurationKeyName("DOWNLOAD_CLIENT")]
+    public Enums.DownloadClient DownloadClient { get; init; } = Enums.DownloadClient.QBittorrent;
+}

code/Common/Configuration/EnvironmentVariables.cs

@@ -1,6 +0,0 @@
-namespace Common.Configuration;
-
-public static class EnvironmentVariables
-{
-    public const string DownloadClient = "DOWNLOAD_CLIENT";
-}