Add chat delay, join-motd, mention feature

[TranHoNgocBao]

Please add a chat delay and join-motd feature, as well as the ability to mention other users.

[vLuckyyy]

Hi, this is not a chat-managing plugin, this is only a chat formatting plugin, at this moment I don't plan to add these features, but I will ask others about it, at the moment it seems to be an unnecessary option for this plugin.