add 00_Alternate_Langage folder and move alternate ports there

00_Alternate_Languages/90_Tower/csharp/Program.cs

@@ -0,0 +1,27 @@
+using System;
+using Tower.Resources;
+using Tower.UI;
+
+namespace Tower
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.Write(Strings.Title);
+
+            do
+            {
+                Console.Write(Strings.Intro);
+
+                if (!Input.TryReadNumber(Prompt.DiskCount, out var diskCount)) { return; }
+
+                var game = new Game(diskCount);
+
+                if (!game.Play()) { return; }
+            } while (Input.ReadYesNo(Strings.PlayAgainPrompt, Strings.YesNoPrompt));
+
+            Console.Write(Strings.Thanks);
+        }
+    }
+}