List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=min_ranking&page=5999
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "summary": "Ponto de encontro dos jogadores brasileiros",
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            "description": "Absolute time of 12 days.  Please don't join if you don't play actively or are planning to go on vacation. The tournament will begin when 10 people have joined.",
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            "name": "9x9 Mini League 1k-9k #29",
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        {
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            "description": "A bag full of chocolate eggs ...",
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            "description": "No analysis. Counting is good for you.\n\nEnjoy!",
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        {
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