Hey there
Avoid reading game memory or do anything else that might be considered cheating.
Displaying information should be OK as long as you don't use it to control/automate your game. But best to check that first.
Maybe you won't even need an AddOn. If I remember correctly AHK has OCR capability, so you might be able to extract the "@Player has logged on" message right from the screen.
If this doesn't work or you want to get other infos as well you could write an addon that has an info box in a corner for AHK to watch. You can put text or colour coded information in that box. Maybe even bar- or QR-codes, but that might be too much and distract you while playing.
Also try to avoid refreshing the info in an unthrottled while loop, otherwise your game might freeze or you get kicked for too many API calls. Use a delay or event hooks instead
It might also be worth looking into how Razer Chroma gets info from the game. Never done anything with that so I'm not sure.