List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-player_count&page=546
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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            "description": "If your rank changes to be outside the tournament Rank Restriction, please move yourself to the appropriate tournament. Enjoy your games.",
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            "description": "Register for the Independence Day 9x9 tournament!\n\nThe tournament will start at 10am on 15th August, and matches will be back-to-back. Everyone plays 5 matches.",
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