List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=first_pairing_method&page=240
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "name": "Quarantine Tournament (5) 19x19",
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                "username": "sleepypeanutpot",
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            "description": "Train your Go-brain while staying at home!\nHave fun and don’t be bored!\nEveryone Welcome! 30kyu-9dan :)",
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