Client username and password for website (HTML)

I need part of my website to have a username and password entry for my clients. I would like it to generate this for them automatically and respond to their request via email. Please send examples of your work. I want to be able to have separate folders for each one and add files and photos to it. Must be compatible with the rest of the website. Person must have 100% open communication and be able to be reached via email, skype, or phone. Thanks and good luck bidding.