List all tournaments or create a new tournament.

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HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "name": "9x9 Round Robin.",
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                "username": "🐬Sofiam🐬",
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                "name": "Go friends 🐬",
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            "name": "Fast Cor. 9x9 10player R-Robin. Starts when full. Dec'19fB",
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                "username": "Kosh-retired",
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            "description": "---\n- STARTS WHEN FULL & Does NOT pause on the weekend.\n\n- Just one round. Ten players, nine games, Chinese Rules/Scoring.\n\n- If this suits you then, Bonne Partie. :)\n\n- This is a '**FAST** Correspondence Tournament'. Please avoid delaying your games using the Vacation feature or Pause. Any participant using Vacation or Pause may be disqualified (and forfeit unfinished games) at the discretion of the Tournament Director.\n\nPlease make sure you understand the 'Clock' settings before you join this tournament.\n\nIt typically takes 3-4 weeks to complete and you will need to log on and play at two well-spaced times most days to avoid losing by timeout.\n\n...and please invite your friends. :)",
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            "name": "9x9 Open League #24",
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            "description": "Open league for everyone. Tournament will be started as soon as 10 players will join it.\n\nPrevious winners: https://online-go.com/group/10842",
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            "description": "Special league for players between 25kyu and 10kyu. Tournament will be started as soon as 5 players will join it.\n\nPrevious winners: https://online-go.com/group/10842",
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            "name": "Julko's Mini Tournament XXIV",
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                "username": "Julko",
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            "description": "Just for fun!",
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            "group": {
                "id": 78,
                "name": "OGS Mini Tournaments",
                "summary": "The home for all of the old OGS mini tournaments",
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            "name": "Torneo de Reyes Vagos 2016",
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                "username": "Iñaki",
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            "description": "Torneo en línea abierto a todos, pero con la \"esperanza\" de una mayor participación de residentes en Querétaro. \nTablero de 9x9\nReglas Japonesas\n30k a 1k\nPor correspondencia (2 dias por jugada)",
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            "description": "Part of an arena tournament - 2026. For details, rules and arena-standings see the group page.\n\nThe tournament will start as soon as it is full (10 players).",
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