List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=max_ranking&page=427
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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        {
            "id": 1500,
            "name": "mock turtle",
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                "username": "orbitaleccentric",
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        {
            "id": 47890,
            "name": "hi go",
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        {
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