add signalr support

Program.cs

@@ -1,9 +1,11 @@
+using BinaryDad.Notes;
 using BinaryDad.Notes.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
 builder.Services.AddControllersWithViews();
+builder.Services.AddSignalR();
 builder.Services.AddSingleton<INoteService, FileNoteService>();
 
 var app = builder.Build();
@@ -24,4 +26,6 @@ app.MapControllerRoute(
     name: "default",
     pattern: "{controller=Home}/{action=Index}/{id?}");
 
+app.MapHub<NoteHub>("/noteHub");
+
 app.Run();