Add tasks for all the new languages

Task/Simple-windowed-application/Nim/simple-windowed-application.nim

@@ -0,0 +1,22 @@
+import gtk2
+
+var
+  win = windowNew WINDOW_TOPLEVEL
+  button = buttonNew "Click me"
+  label = labelNew  "There have been no clicks yet"
+  vbox = vboxNew(true, 1)
+  counter = 0
+
+proc clickedMe(o: var PButton, l: PLabel) =
+  inc counter
+  l.setText "You clicked me " & $counter & " times"
+
+nim_init()
+win.setTitle "Click me"
+vbox.add label
+vbox.add button
+win.add vbox
+discard win.signal_connect("delete-event", SignalFunc mainQuit, nil)
+discard button.signal_connect("clicked", SignalFunc clickedMe, label)
+win.showAll()
+main()