Created permission function for view PDF file in DMS project

Our  project is Document Management System. A document management system (DMS) is a system (based on computer programs in the case of the management of digital documents) used to track, manage and store documents. Most are capable of keeping a record of the various versions created and modified by different users (history tracking). The term has some overlap with the concepts of content management systems. It is often viewed as a component of enterprise content management (ECM) systems and related to digital asset management, document imaging, workflow systems and records management systems. So I also assign to this project in my supervisor. So I also created some parts in this project. I created permission function for view PDF file for this project.All steps are mention below.