List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-max_ranking&page=5221
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=-max_ranking&page=5220",
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            "id": 2773,
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                "username": "Why am I playing",
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                "username": "h4rdl0ck",
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                },
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            "description": "19x19 Round-Robin internal Tournament for Members only.",
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                "name": "German Go L0vers",
                "summary": "Das ist eine private Gruppe nur für interne Turniere.\nThis is a private group for internal tournaments only.",
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        {
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