add sitemap generator which outputs all public pages and also includes an ISitemap interface for modules

Oqtane.Server/Modules/ISitemap.cs

@@ -0,0 +1,12 @@
+using System.Collections.Generic;
+using Oqtane.Models;
+
+namespace Oqtane.Modules
+{
+    public interface ISitemap
+    {
+        // You Must Set The "ServerManagerType" In Your IModule Interface
+
+        List<Sitemap> GetUrls(string alias, string path, Module module);
+    }
+}