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

samples/misc/Webpack/Clientside/PrerenderingSample.ts

@@ -0,0 +1,17 @@
+export default function (params: any): Promise<{ html: string, globals?: any }> {
+    return new Promise((resolve, reject) => {
+
+        // Here, you could put any logic that synchronously or asynchronously prerenders
+        // your SPA components. For example, see the boot-server.ts files in the Angular2Spa
+        // and ReactReduxSpa templates for ways to prerender Angular 2 and React components.
+        //
+        // If you wanted, you could use a property on the 'params.data' object to specify
+        // which SPA component or template to render.
+
+        const html = `
+            <h1>Hello</h1>
+            It works! You passed <b>${ JSON.stringify(params.data) }</b>
+            and are currently requesting <b>${ params.location.path }</b>`;
+        resolve({ html });
+    });
+};