List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=player_count&page=502
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=player_count&page=501",
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            "id": 88765,
            "name": "16/4 1 簡頌賢 2 鄒綽廉",
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                "username": "樂 碁",
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