Created Lua Entity (markdown)

Lua-Entity.md

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+Lua entities are classes exported to Lua that represent the Entity object from EQEmu.
+
+### Properties
+```
+entity.null - Returns true if this object is null
+entity.valid - Returns true if this object is not null
+```
+
+### Member Functions
+```
+Entity() - Creates a null entity
+bool IsClient()
+bool IsNPC()
+bool IsMob()
+bool IsMerc()
+bool IsCorpse()
+bool IsPlayerCorpse()
+bool IsNPCCorpse()
+bool IsObject()
+bool IsDoor()
+bool IsTrap()
+bool IsBeacon()
+int GetID()
+Lua_Client CastToClient()
+Lua_NPC CastToNPC()
+Lua_Mob CastToMob()
+Lua_Corpse CastToCorpse()
+Lua_Object CastToObject()
+Lua_Door CastToDoor()
+```