Add a Reaction to a Post

[askingalot]

As a reader I would like to demonstrate my feelings about a particular Post using the power of an image so that I don't have to think of any words to express myself.

Given a user is viewing a Post details page
When the select a Reaction image
Then a record should be added to the database denoting the user's Reaction to the Post
And a count beside the Reaction image should be incremented