Created Perl EVENT_SPAWN (markdown)

Perl-EVENT_SPAWN.md

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+EVENT_SPAWN is triggered when an NPC spawns.  This event is often used to start timers, attack player targets, establish NPC HP events or proximities, start dialogues, and more.  
+
+### Triggered
+
+* When the NPC spawns.
+
+### Examples
+
+* This example establishes the NPC's proximity under the spawn event, and speaks a message once the player has entered and then exits that proximity using [EVENT_EXIT](https://github.com/EQEmu/Server/wiki/Perl-EVENT_EXIT)
+
+```perl
+sub EVENT_SPAWN {
+     #:: Set the proximity bounds around the NPC on spawn, 15 unit radius
+     my $x;
+     my $y;
+     $x = $npc->GetX();
+     $y = $npc->GetY();
+     quest::set_proximity($x-15,$x+15,$y-15,$y+15);
+}
+
+sub EVENT_EXIT {
+     #:: Triggered when the player leaves the NPC's proximity
+     quest::say("Come back soon!");
+}
+```
+
+* In this example, the NPC would depop when its health reaches 50 percent as set by [quest::setnexthpevent()](https://github.com/EQEmu/Server/wiki/Perl-Quest-setnexthpevent)
+
+```perl
+sub EVENT_SPAWN {
+     #:: Set the threshold (by percent) to trigger the HP Event - 50 percent
+     quest::setnexthpevent(50);
+}
+
+sub EVENT_HP {	
+     #:: Once the NPC's health reaches the percentage specified, depop
+     if ($hpevent == 50) {
+          quest::depop();
+     }
+}
+```
+
+* You can also use this event to set special attacks, run states, sit states, etc.
+* In this example, the NPC will immediately run and attack a nearby player while shouting its war cry
+
+```perl
+sub EVENT_SPAWN {
+     #:: Set the NPC to run
+     quest::SetRunning(1);
+     #:: Shout out a war cray
+     quest::shout("For Jotenheimr!!!");
+     #:: Try to find a random client within 200 units of the NPC
+     my $rClient = $entity_list->GetRandomClient($x,$y,$z, 200);
+     #:: If there's a random sucker nearby, attack them
+     if ($rClient) {
+          quest::attack($rClient->GetName());
+     }
+}
+```