List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-min_ranking&page=1425
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "name": "Go Architecture",
                "summary": "Active Go research group, feel free to join.\nhttps://www.youtube.com/watch?v=D8IdVyIVNZk\nhttps://www.youtube.com/watch?v=Dmlyg1uzpNs",
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            "id": 60331,
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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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        {
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