List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-subsequent_pairing_method&page=5324
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "Special league for players between 15kyu and 5kyu. Tournament will be started as soon as 5 players will join it.\n\nPrevious winners: https://online-go.com/group/10842",
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            "description": "Hola a todos! Armé este torneo 9x9 sólo para miembros del grupo. Si falta alguien pueden invitarlo",
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