ConfigFileJSON.cs

public class ConfigFile
    {
        public int someconfig = 10;

        public static ConfigFile Read(string path)
        {
            if (!File.Exists(path))
            {
                ConfigFile config = new ConfigFile();

                File.WriteAllText(path, JsonConvert.SerializeObject(config, Formatting.Indented));
                return config;
            }

            return JsonConvert.DeserializeObject<ConfigFile>(File.ReadAllText(path));
        }
    }