List all tournaments or create a new tournament.

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HTTP 200 OK
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Content-Type: application/json
Vary: Accept

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            "description": "このトーナメントは下記の方が参加予定です。空きがないため参加者となっていない方は参加することができません。\n\nThis tournament have already been \"reserved\" for members listed below. If you are not one among them, don't click \"Join this tournament!\". (There is no vacancy.)\n\nmicky0427さん、peipeipeiさん、dk0710さん、sinnya1109さん、yutakamiさん、マカロニさん、shinji01さん、Novakunさん、ほんばさん、mekilaさん",
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            "description": "see u",
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                "name": "Champ like play go",
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                "summary": "This group exists as a place to enjoy weekly tournaments with competitively minded players using the lesser known but arguably strategically superior New Zealand rule set. All are welcome here ヽ(≧◡≦)ノ",
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