Created Perl EVENT_ATTACK (markdown)

Perl-EVENT_ATTACK.md

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+EVENT_ATTACK is triggered when the NPC is attacked.  Often this event is used for flavor text or to spawn adds.  Do not confuse this event with [EVENT_AGGRO](https://github.com/EQEmu/Server/wiki/Perl-EVENT_AGGRO), which is triggered when the NPC aggros a player.
+
+### Triggered
+
+* When the NPC is attacked by a player
+
+### Example
+
+* This is a well-known example where Derakor the Vindicator (Vindi) shouts when attacked by a player
+
+```perl
+sub EVENT_ATTACK {
+     quest::shout("Your kind will not defile the temple of Rallos Zek!");
+}
+```