Merge pull request #149 from silviak/patch-1

Create HelloWorld.cs

Author: danielabrozzoni

Hello World! /HelloWorld.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Hacktoberfest
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}