List all tournaments or create a new tournament.

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HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "username": "🐬⚔️🐬 🍩🥂🕯️🌱",
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            "description": "We put the _chill_ in chiliad.\n\n<small>(Disclaimer: The tournament is free-for-all. You don't actually have to be a millennial.)</small>",
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            "description": "Long tournament for 25 to 5 kyu players :)",
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