fix https://github.com/ElectronNET/Electron.NET/issues/21

ElectronNET.CLI/Commands/VersionCommand.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace ElectronNET.CLI.Commands
+{
+    public class VersionCommand : ICommand
+    {
+        public const string COMMAND_NAME = "version";
+        public const string COMMAND_DESCRIPTION = "Displays the ElectronNET.CLI version";
+        public const string COMMAND_ARGUMENTS = "";
+        public static IList<CommandOption> CommandOptions { get; set; } = new List<CommandOption>();
+
+        public VersionCommand(string[] args)
+        {
+        }
+
+        public Task<bool> ExecuteAsync()
+        {
+            return Task.Run(() =>
+            {
+                var runtimeVersion = typeof(VersionCommand)
+                    .GetTypeInfo()
+                    .Assembly
+                    .GetCustomAttribute<AssemblyFileVersionAttribute>();
+
+                Console.WriteLine($"ElectronNET.CLI Version: " + runtimeVersion.Version);
+
+                return true;
+            });
+        }
+
+    }
+}