List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-auto_start_on_max&page=390
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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                "name": "OST GO",
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            "name": "Samuel's teaching night",
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                "username": "Mapledge",
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            "description": "Tournament after top mistakes~ (who will make the most mistakes?)",
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