List all tournaments or create a new tournament.

GET /api/v1/tournaments/?ordering=-players_start&page=5556
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/?ordering=-players_start&page=5555",
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            "name": "Cybèle and fuseki3",
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            "description": "Super go to go!!!",
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            "name": "The 4th Murase Go Group Tournament",
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