Created Perl EVENT_SLAY (markdown)

Perl-EVENT_SLAY.md

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+EVENT_SLAY is triggered when an NPC kills a player.  Often this event is used for some flavor messages, or to spawn adds.  Do not confuse this event with [EVENT_DEATH_COMPLETE](https://github.com/EQEmu/Server/wiki/Perl-EVENT_DEATH_COMPLETE) or [EVENT_DEATH](https://github.com/EQEmu/Server/wiki/Perl-EVENT_DEATH), which are used when a player kills an NPC.
+
+### Triggered
+
+* When an NPC kills a player
+
+### Example
+
+* This is a well-known example from Emperor Ssraeshza, who mocks any player that he kills
+
+```perl
+sub EVENT_SLAY {
+	quest::say("Your god has found you lacking.");
+}
+```