List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-player_count&page=3058
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=-player_count&page=3057",
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