code: function createImgUrl(content){
    genericTemplate.attachment.payload.elements[0].title = content.title
    genericTemplate.attachment.payload.elements[0].subtitle = content.subtitle
    genericTemplate.attachment.payload.elements[0].image_url = content.image_url
    genericTemplate.attachment.payload.elements[0].buttons[0].url = content.directions
    genericTemplate.attachment.payload.elements[0].buttons[0].title = "¿Cómo llegar?"  
    return genericTemplate
  }
docs: createImgUrl() sends an image with a title, subtitle, an buttons