Add Enterprise Keyword field into List using CSOM

AddTaxkeywordFieldInList.cs

private static void AddTaxkeywordFieldInList(List list)
{
    var ctx = list.Context as ClientContext;
    var taxKeywordField = ctx.Site.RootWeb.Fields.GetByInternalNameOrTitle("TaxKeyword");
    var taxKeywordFieldInList = list.Fields.Add(taxKeywordField);
    ctx.ExecuteQuery();
}