Added setup instructions in README.
Updated autoload configuration.
Auto-loading
Libraries : database, session and form validation
Helpers : url
Added encryption key for session in config file.
Added database (sample) details in database.php
Extended CI model with base methods.
Added Base User Model.
Extended Based User Model for Super Admins model.
Extended base user model for Admins Model.
Extended base user model for Users.
Added missing access modifier in admins model.
Extended CI Form Validation with some other required form validation rules.
Extended CI Form Helper for validation errors array.