List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-max_ranking&page=5667
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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        {
            "id": 9518,
            "name": "Baja 19x19 15k-11k",
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                "username": "mita va",
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                "name": "Magyar",
                "summary": "Hungarian go players",
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            "ended": "2019-01-13T14:24:34.188150Z",
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        },
        {
            "id": 592,
            "name": "flowman's third mini-tournament",
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                "name": "OGS Mini Tournaments",
                "summary": "The home for all of the old OGS mini tournaments",
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        {
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            "description": "リーグ開始時に参加されているメンバーでの総あたり戦になります。(レーティングによる自動ハンデ付き)\n\n全部のゲームが一斉に始まりますので、自分の手番になっている対局はどんどん着手していきましょう。",
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                "id": 7692,
                "name": "Yushima Go Cafe (湯島囲碁喫茶)",
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                "name": "Hong Kong ",
                "summary": "First priority : HK people join plz                                                                     \nThis group welcomes everyone, but only if you don't be rude.",
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        {
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                "name": "OGS Mini Tournaments",
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