library/car_app/controllers/main.py

from odoo import http

class Cars(http.Controller):

    @http.route('/library/car_app', auth='user')
    def list(self, **kwargs):
        Car = http.request.env['car.data']
        cars = Car.search([])
        return http.request.render(
            'car_app.data_list_template', {'cars':cars})