Game Play, User Story 5, when I click on a favorite button

As a user, when I

[x] click on the FAVORITE button, I want the animal I am viewing to be saved somewhere and I want to be able to view it later.
[x] Create a new instance on the favorite animals table in the BE that holds the animal ID number for referencing later
[x] POST request to the BE favorites table
[x] RSpec test for the POST to the BE

Down-the-Rabbit-Holes / tickets_only_repo