Actually Exchange is a trading platform but if any one "don't have money to invest or some one want to learn trading without investing money" this was the thought i was having that time and i thought new users will learn trading .. for this project i hired a free lancing company. that time they shared a pdf called legal agreement.  for a six months they worked for me and they given progress as well once i payed 70% of money they left with code and my servers doesn't have any code & their phone numbers are not reachable