List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-max_ranking&page=5530
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "username": "🦁 Lvicala 🦁",
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            "analysis_enabled": false,
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            "started": "2012-03-06T18:18:33Z",
            "ended": "2012-03-06T17:18:33Z",
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}