List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=max_ranking&page=332
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "\"enjoy the procedure and the goal will unfold\"<br>\na move a day won't be enough ...<br><br><img src=\"http://www.veterator.com/pic/cry/clone_closed.png\"><br>Onegaishimasu =)",
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                "username": "🦁 Lvicala 🦁",
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