[CHANGE] Working on client manager

Manager.App/Services/System/ClientManager.cs

@@ -0,0 +1,15 @@
+using Manager.YouTube;
+
+namespace Manager.App.Services.System;
+
+public class ClientManager : BackgroundService
+{
+    private readonly List<YouTubeClient> _clients = [];
+    
+    protected override Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        throw new NotImplementedException();
+    }
+    
+    
+}