List all tournaments or create a new tournament.

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HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "description": "*** Edition 3 ***\n\nThe idea is to have a fast tournment every week.\n\nThe type of tournment is open for changes in future editions (feel free to comment in the tournment  chat).\n\nThanks and have fun.",
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