Initial data commit

Task/Hello-world-Graphical/Genie/hello-world-graphical.genie

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+[indent=4]
+/*
+  Genie GTK+ hello
+  valac --pkg gtk+-3.0 hello-gtk.gs
+  ./hello-gtk
+*/
+uses Gtk
+
+init
+    Gtk.init (ref args)
+    var window = new Window (WindowType.TOPLEVEL)
+    var label = new Label("Goodbye, World!")
+    window.add(label)
+    window.set_default_size(160, 100)
+    window.show_all()
+    window.destroy.connect(Gtk.main_quit)
+    Gtk.main()