add McMaster.Extensions.CommandLineUtils and first sample code

ElectronNET.CLI/Program.cs

@@ -1,12 +1,38 @@
-using System;
+using McMaster.Extensions.CommandLineUtils;
+using System;
+using System.IO;
 
 namespace ElectronNET.CLI
 {
     class Program
     {
-        static void Main(string[] args)
+        static int Main(string[] args)
         {
-            Console.WriteLine("Hello World from electronize xy");
+            var app = new CommandLineApplication();
+
+            app.Name = "electronnet";
+            app.HelpOption("-?|-h|--help");
+
+            app.OnExecute(() =>
+            {
+                Console.WriteLine("Hello World!");
+                return 0;
+            });
+
+            app.Command("start", (command) => {
+                command.Description = "Start ASP.NET Core project with Electron.";
+                command.HelpOption("-?|-h|--help");
+
+                command.Argument("path", "Path to the ASP.NET Core project");
+
+                command.OnExecute(() => {
+                    Console.WriteLine(Directory.GetCurrentDirectory());
+                    Console.WriteLine(command.Arguments[0].Value);
+                });
+
+            });
+
+            return app.Execute(args);
         }
     }
 }