List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-max_ranking&page=701
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "OGSのトーナメントの方式がよくわからないのでお試しで9路大会を開催します。オール互先で対戦者はランダムで決まります。奮ってご参加ください。",
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