List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=max_ranking&page=5425
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "next": "https://online-go.com/api/v1/tournaments/?format=api&ordering=max_ranking&page=5426",
    "previous": "https://online-go.com/api/v1/tournaments/?format=api&ordering=max_ranking&page=5424",
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            "name": "19x19 Open D.E. Cup #169",
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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/12599",
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                "name": "GO Special Tournaments",
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