Setting up an Ada hello world project

["markww" <markww@gmail.com>]

Hi,

I finally got a working compiler for windows. However, I'm not quite
sure how to go about compiling a hello world application. The default
project created one source file with the text:

    project Ada_LinkedList is
      for Object_Dir use "..\..\..\";
          for Main use ("main");

    end Ada_LinkedList;

but the compiler complains that there are no Ada sources in this
project. How do I go about adding an Ada source? I just want to run
something like:

    with Ada.Text_IO;

    procedure Hello is
    begin
       Ada.Text_IO.Put_Line("Hello, world!");
    end Hello;

Where does one #include this in Ada? 

Thanks,
Mark