Update Permission System

Permission-System.md

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-Cookie Utils permission system uses groups for assigning permissions.
+### Cookie Utils permission system 
+Permission system uses groups for assigning permissions.
 
 Plugin will always try to create permission group called `default` if it doesn't exist already, file with name `default.json` in location `server_folder/perm_groups/` will always have id `default`.
 Default groups is one that is used for players that don't have group assigned by authorized person.