Add the license information (#55678)

Fixes goofs mistake when porting wrestling and adds a notif to hulk
swing loop

code/datums/martial/wrestling.dm

@@ -1,3 +1,10 @@
+/*
+The contents of this file were originally licensed under CC-BY-NC-SA 3.0 as part of Goonstation(https://ss13.co).
+However, /tg/station and derivative codebases have been granted the right to use this code under the terms of the AGPL.
+The original authors are: cogwerks, pistoleer, spyguy, angriestibm, marquesas, and stuntwaffle.
+If you make a derivative work from this code, you must include this notification header alongside it.
+*/
+
 /mob/living/carbon/human/proc/wrestling_help()
 	set name = "Recall Teachings"
 	set desc = "Remember how to wrestle."

code/datums/mutations/hulk.dm

@@ -151,7 +151,13 @@
 	yeeted_person.emote("scream")
 	swing_loop(the_hulk, yeeted_person, 0, original_dir)
 
-/// For each step of the swinging, with the delay getting shorter along the way. Checks to see we still have them in our grasp at each step.
+/**
+ * Does the animations for the hulk swing loop
+ *
+ * This code is based in part on the wrestling swing code ported from goon, see [code/datums/martial/wrestling.dm]
+ * credit to: cogwerks, pistoleer, spyguy, angriestibm, marquesas, and stuntwaffle.
+ * For each step of the swinging, with the delay getting shorter along the way. Checks to see we still have them in our grasp at each step.
+ */
 /datum/mutation/human/hulk/proc/swing_loop(mob/living/carbon/human/the_hulk, mob/living/carbon/yeeted_person, step, original_dir)
 	if(!yeeted_person || !the_hulk || the_hulk.incapacitated())
 		return