List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=min_ranking&page=5161
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "started": "2021-02-28T02:00:35.492549Z",
            "ended": "2021-06-27T15:18:41.916154Z",
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}