Available categories: 'appearance', 'belongings', 'character', 'life', 'limited', 'permanent'
GET /questions/:category Get all questions of the category
GET /question/:category/:questionId Get a specific question
Get /question/:category/:questionId/save Save the question
Get /question/:category/:questionId/unsave Unsave the question
Post /question', addQuestion Post a question in the category { category, question }
Post /question/:category/:questionId/answer Add an answer to the question in the category { answer }