List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=subsequent_pairing_method&page=5793
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "summary": "Gruppe für offene Online-Turniere des Badischen Go-Vereins",
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            "time_start": "2020-04-10T11:00:00Z",
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            "exclusivity": "group",
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            "start_waiting": "2020-04-10T11:00:59.550792Z",
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}