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

samples/misc/Webpack/Controllers/FullPagePrerenderingController.cs

@@ -0,0 +1,25 @@
+using System;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.SpaServices.Prerendering;
+using Webpack.ActionResults;
+
+namespace Webpack.Controllers
+{
+    // This sample shows how you could invoke the prerendering APIs directly from an MVC
+    // action result.
+    public class FullPagePrerenderingController : Controller
+    {
+        private static JavaScriptModuleExport BootModule = new JavaScriptModuleExport("Clientside/PrerenderingSample")
+        {
+            // Because the boot module is written in TypeScript, we need to specify a webpack
+            // config so it can be built. If it was written in JavaScript, this would not be needed.
+            WebpackConfig = "webpack.config.js"
+        };
+
+        public IActionResult Index()
+        {
+            var dataToSupply = new { nowTime = DateTime.Now.Ticks };
+            return this.Prerender(BootModule, dataToSupply);
+        }
+    }
+}