List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=handicap&page=28
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "name": "Quick & Review 8 - Go Basics Live Swiss Tournament (HANDICAP!)",
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                "username": "xhu98",
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