List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-max_ranking&page=5538
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "Please check the time settings before your Registration.\nYou Can use the conditional move feature to speed up the game.",
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                "username": "Krios.",
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            "description": "Enjoy :)\nJoin the group (AI study) to discuss all things go AI\nhttps://online-go.com/group/11990",
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        {
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            "description": "MERRY CHIRSTMAS!",
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                "summary": "First priority : HK people join plz                                                                     \nThis group welcomes everyone, but only if you don't be rude.",
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