List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=players_start&page=332
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=331",
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                "id": 5925,
                "name": "Group for GO",
                "summary": "Don't have a group? No problem, just join this group!",
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            "id": 95233,
            "name": "第5期かおり杯棋聖戦Aリーグ",
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            "description": "このトーナメントは下記の方が参加予定です。空きがないため参加者となっていない方は参加することができません。\n\nThis tournament have already been “reserved” for members listed below. If you are not one among them, don’t click “Join this tournament!”. (There is no vacancy.)\n\nmekilaさん、マカロニさん、sinnya1109さん、yutakamiさん、ほんばさん、Jango0123さん",
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                "name": "かおり杯-World Kaori Cup-",
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