List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-first_pairing_method&page=568
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "started": "2022-01-18T02:10:39.611119Z",
            "ended": "2022-05-02T12:08:40.882649Z",
            "start_waiting": "2022-01-18T02:10:39.458731Z",
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}