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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                "summary": "A group for Go players who love the 9x9 board.",
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            "description": "Welcome to the University of York Go Society. Although this is called a \"tournament\", don't worry about it being too competitive. Really, this is just a chance to play and have fun. If the tournament gets full, I will make another. So join in and enjoy your games!",
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