List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-players_start&page=5556
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=-players_start&page=5555",
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            "name": "第7回ほたて会[第3回春風戦]上級リーグ",
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                "username": "ほたて囲碁教室2",
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