some helloworld crap

csharphelloworld.cs

@@ -0,0 +1,18 @@
+// https://www.geeksforgeeks.org/how-to-compile-decompile-and-run-c-code-in-linux/
+//
+// Use mcs compiler to create a windows executable csharphelloworld.exe from csharphelloworld.cs
+//
+// mcs -out:csharphelloworld.exe csharphelloworld.cs
+// mono csharphelloworld.exe
+
+using System;
+ 
+public class GFG {
+ 
+    static public void Main()
+    {
+        Console.WriteLine("Hello World!");
+        Console.ReadKey();
+      
+    }
+}