List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-subsequent_pairing_method&page=4098
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "明けましておめでとうございます。令和4年打ち始めトーナメントです。喜楽にご参加下さい。総当たり、オール互先です。",
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            "description": "Only a few close friends were invited.\n\n#RESPECT",
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