List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=first_pairing_method&page=546
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "name": "GO Special Tournaments",
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                "username": "Why am I playing",
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                "id": 454,
                "name": "Tournament Club",
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