List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=max_ranking&page=5486
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "Test tournament",
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        {
            "id": 112658,
            "name": "Alan Turing Nines Title Tournament 2023",
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                "username": "gamesorry",
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        {
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                "summary": "You want to become World Champion or a Continental champion? Join us :)",
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