Add changeling briefing sound (#39465)

* init

* guh

Resources/Audio/Ambience/Antag/attributions.yml

@@ -26,3 +26,8 @@
   license: "CC-BY-SA-3.0"
   copyright: "Made by @ps3moira on Discord for SS14"
   source: "https://www.youtube.com/watch?v=jf1sYGYVLsw"
+- files: ["changeling_start.ogg"]
+  license: "CC-BY-SA-3.0"
+  copyright: "Taken from TG station at commit https://github.com/tgstation/tgstation/commit/436ba869ebcd0b60b63973fb7562f447ee655205"
+  source: "https://github.com/tgstation/tgstation/blob/master/sound/music/antag/ling_alert.ogg"
+

Resources/Prototypes/GameRules/roundstart.yml

@@ -239,6 +239,7 @@
       briefing:
         text: changeling-role-greeting
         color: Red
+        sound: /Audio/Ambience/Antag/changeling_start.ogg
       components:
       - type: ChangelingDevour
       - type: ChangelingIdentity