new_contents: from flask import Flask
  from lytics import settings
  from flask_restful import Resource, Api, reqparse
  from lytics.db import queries
  
  def create_app(config_filename):
      """
      Returns a Flask app given a configuration object
  
      :param config_object: a string which points to a class holding the
      configuration settings
      """
      app = Flask(__name__)
      app.config.from_object(settings.DevelopmentConfig)
  
      from lytics.routes import main
  
      with app.app_context():
          app.register_blueprint(main)
      # api = Api(app)
      # api.add_resource(ExpenditureList, '/api/expenditures/')
      # api.add_resource(Expenditure, '/api/expenditure/<expenditure_id>/')
  
      return app
  
subject: Add application file