List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=exclusivity&page=23
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "このトーナメントは下記の方が参加予定です。\n\nThis tournament have already been “reserved” for members listed below. \n\nkiku11さん、えいちゃくさん、onesound69さん、kabakenさん、fumi23さん、mitchum_ogaさん、SapporoHeitaさん、かおり Kaoriさん、あしおとさん、s578gz589さん",
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