List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-subsequent_pairing_method&page=5745
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "username": "Peter ;)",
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            "description": "Double-Elimination tournament for everyone. It will be started as soon as 8 players will join it.\n\nPrevious winners: https://online-go.com/group/10842",
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                "summary": "A group for Go players who love the 9x9 board.",
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            "description": "Start when Tournament have 8 players",
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                "id": 454,
                "name": "Tournament Club",
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            "subsequent_pairing_method": "random",
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            "analysis_enabled": true,
            "exclusivity": "open",
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        {
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            "name": "Fast Double Elimination for 10k-13k # II",
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                "username": "Sch-Mentor",
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