List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-players_start&page=5434
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。参加者となっていない方は、運営への連絡なしにトーナメントに参加することはご遠慮ください(本来参加すべき方が参加できなくなります。)。\n\nもし、今から参加したいということであれば、site15までご連絡ください。\n\nThis tournament have already been \"reserved\" for members listed below. If you want to join this tournament, please send a message to site15 and get approval before clicking \"Join this tournament!\".\n\nびくまるさん、ushida05さん、Joel Barrettさん、kabakenさん、\nHagirinさん、nassyさん、gushio0703さん、KYBBさん",
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