List all tournaments or create a new tournament.

GET /api/v1/tournaments/?ordering=-max_ranking&page=5617
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/?ordering=-max_ranking&page=5616",
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                "username": "🦁 Lvicala 🦁",
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            "name": "9x9 tournament, let's see who can survive!",
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            "description": "练习赛\n\n如无特殊情况参加者不能用假期功能停止计时,大家要多运用预设条件下子功能。\n\n参加者下的棋我都会做简单的复盘,会在对局里摆出变化图\n\n另外若新比赛开始时,老比赛没有完成任何一局的成员,需要先至少完成一场老比赛才能报名新比赛",
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            "description": "This is just a simple Swiss tournament. Anyone who wants to can join. I've put a 9K - 26K level restriction. Enjoy!",
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                "summary": "HOW DO YOU DELETE A GROUP YOU STARTED?",
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