Rename helloworld.java to helloworld.v

.github/helloworld.java

@@ -1,16 +0,0 @@
-// A Hello World! program in C#.
-using System;
-namespace HelloWorld
-{
-    class Hello 
-    {
-        static void Main() 
-        {
-            Console.WriteLine("Hello World");
-
-            // Keep the console window open in debug mode.
-            Console.WriteLine("Press any key to exit.");
-            Console.ReadKey();
-        }
-    }
-}