List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=board_size&page=5844
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=board_size&page=5843",
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            "id": 74313,
            "name": "First Live Friendly Friends Go Tournament Club Tournament!",
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        {
            "id": 70795,
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