List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-player_count&page=5380
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "next": "https://online-go.com/api/v1/tournaments/?format=api&ordering=-player_count&page=5381",
    "previous": "https://online-go.com/api/v1/tournaments/?format=api&ordering=-player_count&page=5379",
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            "id": 95829,
            "name": "Blitz",
            "director": {
                "id": 599102,
                "username": "🐬⚔️🐬 🍩🥂🕯️🌱",
                "country": "bs",
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            "description": "Have fun",
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            "group": {
                "id": 10635,
                "name": "Blitz ⚡",
                "summary": "Welcome,\n\nBlitz style tourneys, please join if you like speedy Go!\n\n\n",
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            "name": "4 -> 錢尚鋒 5 -> 陳灝",
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                "country": "un",
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