SL-19139 Credits for Kitty - update the contributors.txt file with a mention...

SL-19139 Credits for Kitty - update the contributors.txt file with a mention of Kitty's large contribution. (No externally facing JIRA that I can find)

doc/contributions.txt

@@ -884,6 +884,7 @@ Kitty Barnett
 	STORM-2149
 	MAINT-7581
 	MAINT-7081
+	DRTVWR-489 (Internal JIRA that tracks Kitty's sizeable, epic contribution: support for Emoji characters in the Viewer [April 2023])
 Kolor Fall
 Komiko Okamoto
 Korvel Noh