List all tournaments or create a new tournament.

GET /api/v1/tournaments/?ordering=players_start&page=5678
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=5677",
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            "description": "This Round Robin Tournament honors the birthday (August 14) of Nihon Ki-in 9p professional Hane Naoki-san.",
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            "name": "9x9 Open League #131",
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