void Start()
{
CreateGameField();
MetaField metaField = MetaField.CreateMetaField(columns, rows, Cells);
using (FileStream fs = new FileStream("field.json", FileMode.OpenOrCreate))
{
string json = MetaField.Serialize(metaField);
byte[] info = new UTF8Encoding(true).GetBytes(json);
fs.Write(info, 0, info.Length);
}
}