List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-min_ranking&page=140
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?format=api&ordering=-min_ranking&page=139",
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            "description": "PLEASE JOIN",
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                "summary": "ONLY FOR MY FRIENDS! SO FRIEND ME NOW!",
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            "description": "no any problem thx",
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