Study Spot "Likes" / "Favorites" Setup

[daviskeene]

Description

Some study spots are liked more than others on campus. We already have a way for users to "Review" a study spot, but what if you want to casually say "I like this place"? We should have a way for users to "Like" certain spots, which gives us some sense of how popular study spots are. This can be another search/filter/sort parameter.

Progress

• Add favorites or likes as a field to Spot.
• Set up middleware routes to add a like to a spot (users shouldn't be able to like a study spot more than once).