List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-players_start&page=5481
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "Join the group for more cat tournaments ^__^",
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            "name": "Sunday GO 23 19×19",
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            "description": "Fuñnnnnn",
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                "name": "Sunday GO and MORE",
                "summary": "You can't miss this group, join now!",
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            "name": "SonicBlitz tournament",
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