List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-id&page=2057
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=-id&page=2056",
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                "username": "傳碁學園",
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            "title": null,
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        {
            "id": 90288,
            "name": "9x9 Open D.E. Cup #22",
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            "description": "Double-Elimination tournament for everyone. It will be started as soon as 8 players will join it.\n\nPrevious winners: https://online-go.com/group/10842",
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                "name": "9x9 Lovers",
                "summary": "A group for Go players who love the 9x9 board.",
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