List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-subsequent_pairing_method&page=5825
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": "楽しく打ちましょう。\n皆様の参加をお待ちしています!",
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