Update README.md

   In this project student can sell or buy anything by meeting with each other,this is the way to get the item what we want in the cheap rate.It can save the money and time also. 
   Sometime we can not get to know that which item any student wants to sell and which item any student wants to buy.So this is the easy way to know the details of our items and get this in cheapest prize.This is the way to save the money and the time also.