Available Commands:
add Add participators to a meeting
clearMeeting Clear all the meeting
createMeeting Create a meeting
delete Delete the meeting
delete Delete a participator from meeting
deleteUser Delete one account of Agenda and log out
help Help about any command
login User login
logout User logout
queryMeeting Query the meeting by its title
queryUser Show all registered users
quitMeeting Help the current user to quit the correctsponding meeting by its title
register Used to register account