List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=max_ranking&page=263
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "name": "Even More Fast Tournament",
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            "description": "This tournament is faster than ever!",
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            "group": {
                "id": 5925,
                "name": "Group for GO",
                "summary": "Don't have a group? No problem, just join this group!",
                "require_invitation": false,
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                "hide_details": true,
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                "name": "9x9 Lovers",
                "summary": "A group for Go players who love the 9x9 board.",
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        {
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