List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=min_ranking&page=5613
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=5612",
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            "description": "凡人脳無策会長が長期休暇中です。会長不在で、久しぶりに開催します(^。^)",
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            "description": "helo is dis",
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