added filtering templates & instructions to create new tasks

Added a template for filtering and its documentation. 

Instructions for adding new tasks using django template inheritance are also added. 
What does "pass the filter" mean? Does 0.0 mean "the paper *was* written by Mike" or "the paper *wasn't* written by Mike? In general, we want 0.0 to mean "no" and 1.0 to mean "yes".