add webhook support.

src/DotNetCore.CAP/CAP.Options.cs

@@ -26,6 +26,11 @@ namespace DotNetCore.CAP
         /// </summary>
         public int PollingDelay { get; set; } = 8;
 
+        /// <summary>
+        /// We’ll send a POST request to the URL below with details of any subscribed events.
+        /// </summary>
+        public WebHook WebHook { get; set; }
+
         /// <summary>
 		/// Registers an extension that will be executed when building services.
 		/// </summary>
@@ -38,4 +43,11 @@ namespace DotNetCore.CAP
             Extensions.Add(extension);
         }
     }
+
+    public class WebHook
+    {
+        public string PayloadUrl { get; set; }
+
+        public string Secret { get; set; }
+    }
 }
\ No newline at end of file

src/DotNetCore.CAP/Infrastructure/WebHookProvider.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace DotNetCore.CAP.Infrastructure
+{
+    class WebHookProvider
+    {
+    }
+}