List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-players_start&page=5547
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "ended": "2021-04-08T10:06:33.159943Z",
            "start_waiting": "2021-04-08T10:00:18.103875Z",
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}