Add example of full-page prerendering via a custom action result

samples/misc/Webpack/ActionResults/PrerenderResultExtensions.cs

@@ -0,0 +1,13 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.SpaServices.Prerendering;
+
+namespace Webpack.ActionResults
+{
+    public static class PrerenderResultExtensions
+    {
+        public static PrerenderResult Prerender(this ControllerBase controller, JavaScriptModuleExport exportToPrerender, object dataToSupply = null)
+        {
+            return new PrerenderResult(exportToPrerender, dataToSupply);
+        }
+    }
+}