how would i add a new start-of-turn message?

[jinnes]

Hi all:

I'm new to Civ customization, so my apologies if this is a very basic question.

You know the messages that display at the start of a turn? In Colonization, there is one that warns you when a colony has exceeded storage limits and some goods had to be thrown away. That's good.

But I'd also like to receive a message when a craftsman can no longer produce manufactured goods due to running out of raw materials.

Can someone point me in the right direction for how I'd do that? I assume I'd need to modify a python file, but there a million of them and I'm not sure where to start.

Thanks!