Integrate front-end and back-end code

[sophiefeng18]

Integrate our code from sprint 1 so that the front-end and back-end features are connected.

Estimated effort for each task: medium
Dependencies among tasks: #25 #14 #37
Milestones to indicate which sprint the issue should be completed in (Sprint 1, Sprint 2, Stretch): Sprint 2
Acceptance criteria that describes how you know this task is done - think about how you will test this feature: Actions on the front-end trigger the expected actions and successfully save.