List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=players_start&page=5689
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "Why not another elimination tournament?",
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            "description": "Have fun!",
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            "description": "Bora lá praticar um pouco",
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            "description": "Group #1 will use this just for training games.",
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