Add show object format to README

{
  movie: {
    title: 'The Lego Batman Movie',
    localizedTitle: 'Lego Batman Film',
    year: 2017,
    posterUrl: 'http://media.forumcinemas.ee/1000/Event_6746/portrait_medium/Lego-Batman_B1_EE_Preview.jpg',
    length: 104
  },
  id: 286658,
  time: 2017-02-26T16:10:00.000Z,
  timeUTC: 2017-02-26T14:10:00.000Z,
  dimensions: 3,
  language: 'et',
  isImax: false,
  auditorium: 'Saal 5',
  url: 'http://www.forumcinemas.ee/Websales/Show/286658/',
  cinema: {
    alias: 'ccplaza',
    name: 'Coca-Cola Plaza'
  }
}