List all tournaments or create a new tournament.

GET /api/v1/tournaments?format=api&ordering=-id&page=1183
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
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    "previous": "https://online-go.com/api/v1/tournaments?format=api&ordering=-id&page=1182",
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            "id": 108269,
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                "username": "matburt",
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            "description": "Automatic Sitewide Tournament",
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            "description": "このトーナメントは下記の方が参加予定です。空きがないため参加者となっていない方は参加することができません。\n\nThis tournament have already been “reserved” for members listed below. If you are not one among them, don’t click “Join this tournament!”. (There is no vacancy.)\n\nonesound69さん、rinsiさん、smith0108さん、アタリガールさん、K___k_F_k__さん、びくまるさん、SapporoHeitaさん",
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                "username": "site_tmp",
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            "description": "このトーナメントは下記の方が参加予定です。空きがないため参加者となっていない方は参加することができません。\n\nThis tournament have already been “reserved” for members listed below. If you are not one among them, don’t click “Join this tournament!”. (There is no vacancy.)\n\ntomi-nchi-goさん、Audrey07さん、mitchum_ogaさん、alemitraniさん、BabbLeahさん、Hagirinさん、はっしーのアカウントさん",
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        {
            "id": 108266,
            "name": "第6期かおり杯名人戦高段リーグ2(3d~5d)",
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            "description": "このトーナメントは下記の方が参加予定です。空きがないため参加者となっていない方は参加することができません。\n\nThis tournament have already been “reserved” for members listed below. If you are not one among them, don’t click “Join this tournament!”. (There is no vacancy.)\n\nyuuna_resukaさん、gushio0703さん、smith0108さん、carteriさん、ほんばさん、gusaku066さん、ruy661さん",
            "schedule": null,
            "title": null,
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