Update pluralkit-message.txt

Added text referring to a system frequently active in the server to talk to for any questions

src/asset/pluralkit-message.txt

@@ -4,6 +4,8 @@ I notice that you're confused about chatting with a "BOT", so let me help you sh
 
 The people who use this bot have a condition called Dissociative Identity Disorder (DID), in which the person has two or more personalities (shortened to "alters"). Many people with DID have experienced severe trauma, and in order to help them cope with the stress they've endured (and some who continue to endure), they use their alters to communicate. This is often sadly a chronic disorder, so please try to stay respectful! 
 
-And if you want to know more about the disorder, feel free to head to this thread <#876856211746746388> or ask any of the other systems about it (if they feel comfortable answering, please don't pressure them!) Be respectful. :) 
+And if you want to know more about the disorder, feel free to head to this thread <#876856211746746388> or ask any of the other systems about it (if they feel comfortable answering, please don't pressure them!) Be respectful. :)
+
+Arcueid, a system who's commonly around, can answer your questions as well.
 
 Farewell! <:psi_salute:860198394714652722>