List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-min_ranking&page=801
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "What about joining this tournament? And Anyway, Good Game!",
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                "name": "Group for GO",
                "summary": "Don't have a group? No problem, just join this group!",
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