List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=analysis_enabled&page=5683
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "summary": "En grupp för gointresserade med anknytning till Sverige",
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            "description": "Good luck",
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                "icon": "https://cdn.online-go.com/5.1/img/default-group-v5.svg"
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            "id": 79913,
            "name": "有段リーグ(初段以上)",
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                "id": 776731,
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