implement first demo app template

ElectronNET.WebApp/Controllers/AboutController.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ElectronNET.WebApp.Controllers
+{
+    public class AboutController : Controller
+    {
+        public IActionResult Index()
+        {
+            return View();
+        }
+    }
+}