List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=player_count&page=507
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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    "previous": "https://online-go.com/api/v1/tournaments?format=api&ordering=player_count&page=506",
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            "name": "5 -> 陳琛悠 6 -> 許淳博",
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                "username": "傳碁學園",
                "country": "un",
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            "id": 89853,
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            "description": "Test tournament",
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                "username": "樂 碁",
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