List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-time_per_move&page=28
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "previous": "https://online-go.com/api/v1/tournaments?format=api&ordering=-time_per_move&page=27",
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            "name": "le tournoi pour VOUS 2! :D",
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            "description": "TOURNOI POUR MON GROUPE :)",
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        {
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            "name": "GO CARROT DANCER tournament lol",
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            "description": "....tournament for gcd",
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