add questions query

app/policies/question_policy.rb

@@ -0,0 +1,24 @@
+class QuestionPolicy < ApplicationPolicy
+  class Scope < Scope
+    def resolve
+      scope.all
+    end
+  end
+
+
+  def create?
+    user.roles.present?
+  end
+
+  def update?
+    is?(:admin) || is?(:nde) || (is?(:teacher) && record.user_id == user.id)
+  end
+
+  def destroy?
+    record.user_id == user.id && record.status != "registered"
+  end
+
+  def finish?
+    (is?(:admin) || record.user_id == user.id) && record.status.to_sym == :approved
+  end
+end