How to add user with SFTP/ FTP access to '/var/www/html/website_abc' folder on Amazon EC2 Centos?

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http://serverfault.com – I'm working with some third-party developers and I would like to grant SFTP (or FTP) access to the root folder for a website they're working on i.e. '/var/www/html/website_abc' so that they could upload the files there. Note that I'm hosting my other websites there on the same EC2 instance e.g. '/var/www/html/website_xyz'. Just to emphasize that I'm working with multiple websites on 1 single EC2 instance, the structure of the websites are as follows: /var/www/html/ /var/www/html/website_abc ... /var/www/html/website_xyz My goals are as follows: User 'adeveloper' has access t (HowTos)