Reminder Listing Page

This adds a very simple frontend UI and class functionality to the app.
It's not pretty at all yet (I'm still working on that, I wasn't liking any styles I tried yet) but it's a solid start to work off of.
update: i am re-reading java docs as I haven't written java in too long. 

let's explicitly agree on a common style for when we're going to use 'this.' to fetch class vars. I don't care too strongly either way :) you can leave this as-is if it suits you.