List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-start_waiting&page=3612
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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            "name": "Test tournament",
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            "description": "Not sure how this will work but we'll try it out",
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        {
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                "username": "李建澔2",
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                "summary": "[Our forum page](https://forums.online-go.com/t/go-variants-group/29109) with a lot of rules and games\n",
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