List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=first_pairing_method&page=5468
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "started": "2021-04-04T01:00:51.239607Z",
            "ended": "2021-08-11T00:46:37.853795Z",
            "start_waiting": "2021-04-04T01:00:50.641270Z",
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}