News that pops up in a formspec when a player joins the server

Create a text file called news.txt in the world folder.

This text file can be updated any time and will always be current in game without a server reboot

To add extra articles just create a text file for each article in the world folder in the format

news_[article name].txt

(i.e. news_crafting.txt would show an article for the command /news crafting)