List all tournaments or create a new tournament.

GET /api/v1/tournaments/?ordering=min_ranking&page=5800
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/?ordering=min_ranking&page=5799",
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            "id": 2223,
            "name": "TAKEDA RYU 6th mini-tournament",
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            "id": 138741,
            "name": "FNRRT: Round Robin for 13k-10k [FAST?] # III",
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            "id": 1457,
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            "id": 934,
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            "description": "problem no!gg go play it!",
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