staff only message server option

[Jakov_the_Jakovasaur]

hello!

it would be really convenient if there was a built-in way to provide a message to players whenever attempting to connect to a server that has been set to staff only

for example:

staffonlymessage="Bugs are currently being fixed"

or

staffonlymessage="The server is currently undergoing maintenance"

or

staffonlymessage="A new update is being prepared, try again soon!"