docs: added basic purpose doc to texManager
docs: added basic purpose doc to texManager

infamous/engine,alexanderGugel/engine,infamous/famous-engine,prepare/engine,talves/famous-engine,mcanthony/engine,woltemade/engine,andreaslangsays/engine,artichox/engine,yummy222/engine,beni55/engine,CedarLogic/engine,alexanderGugel/engine,steveblue/engine,redwoodfavorite/engine,noikiy/engine,TheAlphaNerd/engine,aug2uag/engine,Wanderfalke/engine,Morgantheplant/engine,manyoo/engine,Bizboard/engine,noikiy/engine,andreaslangsays/engine,yummy222/engine,trusktr/engine,Bizboard/engine,IjzerenHein/engine,talves/famous-engine,tbossert/engine,sonwh98/engine,mcanthony/engine,Famous/engine,aug2uag/engine,avikalpa/engine,Wanderfalke/engine,infamous/famous-engine,tbossert/engine,avikalpa/engine,infamous/engine,codesdk/engine,woltemade/engine,codesdk/engine,beni55/engine,artichox/engine,prepare/engine,IjzerenHein/engine,huanghjb/engine,steveblue/engine,huanghjb/engine,nmai/engine,TheAlphaNerd/engine,CedarLogic/engine,nmai/engine,manyoo/engine,Morgantheplant/engine,arunabhdas/engine,trusktr/engine,sonwh98/engine,redwoodfavorite/engine,arunabhdas/engine,Famous/engine