Add a chat menu

Hello,
can you add !admin (css_admin) command, which will show every avaliable command in the chat like a menu?
I mean when I type !admin, then it shows these commands in the chat:
Basic Admin Menu:
!1 [slay]
!2 [kick] 
!3 [ban] 
..
..

If someone wants to use !admin without permisson, it shows in the chat:
[Basic Admin] You do not have permission to use this command. 