Applying policy system to the creation of questions.

app/controllers/v1/questions_controller.rb

@@ -19,7 +19,7 @@
 class V1::QuestionsController < ApplicationController
 
   before_action :set_question, only: [:show, :update, :destroy]
-  before_action :authorize!, only: [:update, :destroy]
+  before_action :authorize!, only: [:create, :update, :destroy]
 
   # GET /questions
   def index