List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-time_per_move&page=143
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "started": "2019-08-31T00:30:12.086431Z",
            "ended": "2019-12-01T18:57:33.429170Z",
            "start_waiting": "2019-08-31T00:30:10.182927Z",
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}