List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=max_ranking&page=160
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "count": 60601,
    "next": "https://online-go.com/api/v1/tournaments?format=api&ordering=max_ranking&page=161",
    "previous": "https://online-go.com/api/v1/tournaments?format=api&ordering=max_ranking&page=159",
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                "id": 119,
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                "summary": "Tokyo Go Players Meet Together!",
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            "description": "Let us play!",
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