Outline database schema

[angelazhang043]

Make decisions and discuss what info to collect from users upon login/different steps of the creating a memorial process

[scratchingmycranium]

We also need to design the models for inserting into the db. I have created one model for user signup in my pull request #37. But we need to figure out if we want to include more data in the user model or if we should create a new model and reference it from the respective user.