Add Windows service host and system tray controller

service_host/ScreenJob.WindowsServiceHost/Program.cs

@@ -0,0 +1,18 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using ScreenJob.WindowsServiceHost;
+
+var options = ServiceOptions.Parse(args);
+
+Host.CreateDefaultBuilder(args)
+    .UseWindowsService(serviceOptions =>
+    {
+        serviceOptions.ServiceName = "ScreenJobBackend";
+    })
+    .ConfigureServices(services =>
+    {
+        services.AddSingleton(options);
+        services.AddHostedService<BackendProcessService>();
+    })
+    .Build()
+    .Run();