List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-rules&page=5689
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": "12th happy tourney, I will create a new tournament with this name every Monday, have fun!",
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