List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-subsequent_pairing_method&page=5921
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "name": "World Wide Go Association (WWGA)",
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            "id": 88235,
            "name": "OGS group tournament OpenGotha",
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                "id": 831882,
                "username": "I am kill",
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            "description": "every one can join OpenGotha tournament",
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