vonage的服务端，用于生成jwt和应答语音视频请求

```sh
> vonage users create --display-name Highlights
✅ Creating User

User ID: USR-a778518f-6d94-43b8-ab3c-413e6af8f10a
Name: NAM-3f97db93-da89-4937-b457-14be72b7b62b
Display Name: Highlights
Image URL: Not Set
Time to Live: Not Set

Channels:
  None Set
> vonage users list
✅ Fetching users

User ID                                   Name                                      Display Name
----------------------------------------  ----------------------------------------  ------------
USR-4476dbcc-8e2a-4048-ac8a-8ab49345167a  HighlightsTravel
USR-a778518f-6d94-43b8-ab3c-413e6af8f10a  NAM-3f97db93-da89-4937-b457-14be72b7b62b
USR-9f60dff4-78c3-40c8-9aad-f762df371728  NAM-c54db270-643a-43a6-883e-b8c28d292dbe

Done Listing users
```

region AP 下的用户:

```json
"users": [
    {
        "id": "USR-2e2e267c-e718-4114-b488-bc6677541fd4",
        "name": "Highlights",
        "display_name": "Highlights",
        "_links": {
            "self": {
                "href": "https://api-ap-3.vonage.com/v1/users/USR-2e2e267c-e718-4114-b488-bc6677541fd4"
            }
        }
    }
]
```
