Single Sign On Magento & Codeigniter

I've a Magento website(e.g: [login to view URL]) and want to install my codeigniter web application on same Magento website like this: [login to view URL] My Magento and Codeigniter application both have their own signup forms. So anyone who signup on Magento website will have to signup again on my Codeigniter app. What I want is to make something that if someone signup on my Magento website will automatically signup to my Codeigniter app. Meaning same user data on signup and login session(from Magento website) should be created(on signup or login) in my codeigniter app. So one who signup or login on Magento website won't need to signup or login into my Codeigniter app to use it. Also after login/singup whatever changes are made in profile like email, password, profile photo etc must be changed in my codeigniter app. When you place your bid start your proposal with Magento2Codeigniter to confirm that you have read project requirements otherwise your bid will be rejected. Thanks and happy bidding