Add cloak system to player variables

Author: blueshank-gh

docs/platforms/garrysmod/database/variables/players.md

@@ -57,6 +57,10 @@ Admin checks + naming:
 - `#!ts player:Name(...): string`
 - `#!ts player:RealName(...): string`
 
+Cloak system:
+- `#!ts player:IsCloak(): boolean`
+- `#!ts player:IsCloakTowards(entity: Entity): boolean`
+
 ## Global Player Filters
 - `#!ts player.GetByPermission(...)`
 - `#!ts player.GetByAnyPermission(...)`