Add AddMediator overload for auto-registration from caller

Introduced a new AddMediator extension method in ServiceCollectionExtensions that automatically registers handlers and mediator types from the calling assembly. This simplifies setup by removing the need to manually specify assemblies when configuring MediatR services.

Author: Vadim Belov

Sources/EasyExtensions.Mediator/MicrosoftExtensionsDI/ServiceCollectionExtensions.cs

@@ -19,6 +19,19 @@ namespace Microsoft.Extensions.DependencyInjection
     /// </summary>
     public static class ServiceCollectionExtensions
     {
+        /// <summary>
+        /// Registers handlers and mediator types from the calling assembly automatically.
+        /// </summary>
+        /// <remarks>This method automatically discovers the calling assembly and registers all handlers found within it.
+        /// It is equivalent to calling AddMediator(config => config.RegisterServicesFromAssembly(callingAssembly)).</remarks>
+        /// <param name="services">Service collection</param>
+        /// <returns>Service collection</returns>
+        public static IServiceCollection AddMediator(this IServiceCollection services)
+        {
+            var callingAssembly = System.Reflection.Assembly.GetCallingAssembly();
+            return services.AddMediator(config => config.RegisterServicesFromAssembly(callingAssembly));
+        }
+
         /// <summary>
         /// Registers handlers and mediator types from the specified assemblies
         /// </summary>