Course material sharing webapp

I need a minimalist webapp where students will share and download course materials. There will be only two pages, a homepage and fileview page On homepage students will be able to signup and login The signup process will have two options: 1-fill out all required fields themselves, 2-enter their student number and password and our bots will login to the university system for them and collect information like name surname, which department and what classes that student takes. then the password is deleted and we never use it again. On fileview page student will have list of files available for selected course displayed in a filetree on the left sidebar and whenever a student clicks on any of the files the file should be displayed in view are (see attached mockups for details) a download link for a file that is being previewed also must be present. materials are all pdf or image only. the file preview should work like the one in google docs. this is a minimum viable product test for an idea, if it catches on we will add lots of features and functions and probably we will contract you to do the rest. But for now we can allocate only small budget for this webapp as it is just an experiment. We will pay half of the price when we see working demo on your host and the other half of the price when we have it working perfectly on my host.