Update README.md

README.md

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 ## Steps to use 
 
 -  Add config in `config_paytm.php` in `lib` folder
--  Add config of firestore in `firestore.js` in `js` folder 
+-  Add config of firestore in `db.js` in `js` folder 
 -  Edit 37 line in pgRedirect.php and replace it to ur call back url ie http://yourdomain.com/.../pgResponse.php . <br/>example suppose you are sending data from list.php and inside that folder u cloned this git and renamed the folder to paytm then your call back url will be http://yourdomain.com/paytm/pgResponse.php <br/>A full url is required since that page is paytm processing domain not ur websites domain 
 -  Start your apache and ...
 -  Vola your own paytm payment gateway is ready !!!!