List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-first_pairing_method&page=466
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "exclusivity": "group",
            "started": "2015-10-31T13:56:39.350261Z",
            "ended": "2019-06-07T17:31:34.408650Z",
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}