List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-board_size&page=815
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "username": "𝗣𝘂𝘁 𝗞.",
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            "description": "Cada cierto tiempo un rōnin se te cruza en el camino. Ten cuidado.",
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