Counter-Strike 2

Counter-Strike 2

Mixed Hardcore Survival (2018)
How was the custom player models/skins feature added?
Sorry if this isn't the appropriate place to ask this question or if this is a hard to explain question. But how was the ability to change the player model/skin added to this map? If I wanted to add a feature to a map where the player could change there characters skin just like how it is done on this map, how would I do this? Once again, sorry if this is an annoying question.