GET announcements

[
  {
    "id": 0,
    "title": "string",
    "content": "string",
    "createdByName": "string",
    "createdById": "e13e432a-5323-4484-a91d-b5969bc564d9",
    "createdAt": "2019-08-24T14:15:22Z"
  }
]

{
  "message": "string"
}

{
  "type": "string",
  "title": "string",
  "status": 0,
  "detail": "string",
  "instance": "string",
  "property1": null,
  "property2": null
}