register mediatr

PSManagement.Application/DI/DependencyInjection.cs

 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using PSManagement.Application.Contracts.Authentication;
+using MediatR;
+using System.Reflection;
 
 namespace PSManagement.Application.DI
 {
@@ -8,6 +10,9 @@ namespace PSManagement.Application.DI
     {
         public static IServiceCollection AddApplication(this IServiceCollection services)
         {
+            //services.AddMediatR();
+            services.AddMediatR(Assembly.GetExecutingAssembly());
+
             return services;
         }