text: var db = connect("mongodb://root:rootpword@localhost:27017/admin");
  db = db.getSiblingDB('mernproject'); 
  
  db.createUser(
          {
              user: 'user',
              pwd: 'secret_password',
              roles: [
                  {
                      role: 'readWrite',
                      db: 'mernproject'
                  }
              ]
          }
  	);
  