List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-exclude_provisional&page=4939
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "name": "United se×y boys tournament. the battle for respect",
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                "username": "Уберменш",
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            "description": "Go or not to go?",
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