List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=board_size&page=194
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "Go to our group page to read rules.\n\n<big> If you are in another ultra tournament then you will be disqualified from both",
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