Create a Category

[hannahhall]

As an author I would like to be able to create a new category so that I can better classify my posts.

Given an author is on the Category list page
When they select the Create Category button
Then they should be directed to a form in which they can enter a new category name

Given an author has entered a Category name
When they click the Save button
Then a new category should be saved to the database
And the author should be directed to the Category list page