List all tournaments or create a new tournament.

GET /api/v1/tournaments/?ordering=-rules&page=5807
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=-rules&page=5806",
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                "username": "𝙿𝚞𝚝 𝙺.",
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            "description": "26th happy tourney, I will create a new tournament with this name every Monday, have fun!",
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                "name": "New Zealand Tournaments",
                "summary": "This group exists as a place to enjoy weekly tournaments with competitively minded players using the lesser known but arguably strategically superior New Zealand rule set. All are welcome here ヽ(≧◡≦)ノ",
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            "description": "希望大家踴躍參加",
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