List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=max_ranking&page=4644
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "新しく作り直した、2回目のトーナメントです。",
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            "description": "un tournoi cool pour se détendre ouvert à tout le monde, biz à tous et bonne partie^^",
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            "description": "Vi forsøger igen for at få alle med",
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