List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=time_start&page=3622
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "Want to join? Join:\ngroup-11995",
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                "summary": "Welcome for all of the Kyu GO players! Please join!",
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