2.0 Context object

{
  "title": "Context",
  "message": {
    "text": "Here is some background information.",
    "markup": [ ]
  }
}

Field	Type	Description
`title` required	String	The title of this context message. Example value: `Context information`
`message` optional XOR with media field	2.0 MarkupText	The context information, optionally marked up. Example value: `This capital was founded in the 7th century BC by the Phoenicians, who named it Oea.` Note: either a `message` or a `media` object is required, not both.
`media` optional XOR with message field	2.0 Media	An optional media object. Note: either a `message` or a `media` object is required, not both.