adds candidate recruitment project label field

completes #93

app/controllers/admin/candidate_controller.rb

@@ -54,7 +54,7 @@ module Admin
     private
 
       def candidate_params
-        params.require(:candidate).permit(:name, :email, :experience, :quiz_id)
+        params.require(:candidate).permit(:name, :email, :experience, :quiz_id, :project)
       end
 
       def collect_quizzes