List all tournaments or create a new tournament.

GET /api/v1/tournaments/?ordering=-exclusivity&page=5562
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=-exclusivity&page=5561",
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                "name": "Four Seasons Tournament Series",
                "summary": "Серия турниров \"Четыре Сезона\"",
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            "description": "Let's start a tournament here. Invite some more players from SD to join!",
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