You honestly can't expect someone to send you their assignment. You could easily plagiarise it.
First of all, you would have received an assignment sheet or something that would have detailed the assignment to you. I only did an assignment for infectious diseases so I don't know what you would need to do for a non-infectious disease. Sorry.
Commonly done infectious diseases include cholera, influenza or malaria. You'll have to talk about its cause, transmission, host response, symptoms, treatment, prevention and control. Google, Wikipedia, your textbook and the library are your friends.