Function add 

pub async fn add(
    alpha: bool,
    auto_restart: bool,
    auto_set_nat_flags: bool,
    count: Option<u16>,
    data_dir_path: Option<PathBuf>,
    enable_metrics_server: bool,
    env_variables: Option<Vec<(String, String)>>,
    evm_network: Option<EvmNetwork>,
    log_dir_path: Option<PathBuf>,
    log_format: Option<LogFormat>,
    max_archived_log_files: Option<usize>,
    max_log_files: Option<usize>,
    metrics_port: Option<PortRange>,
    network_id: Option<u8>,
    node_ip: Option<Ipv4Addr>,
    node_port: Option<PortRange>,
    node_registry: NodeRegistryManager,
    init_peers_config: InitialPeersConfig,
    relay: bool,
    rewards_address: RewardsAddress,
    rpc_address: Option<Ipv4Addr>,
    rpc_port: Option<PortRange>,
    src_path: Option<PathBuf>,
    no_upnp: bool,
    url: Option<String>,
    user: Option<String>,
    version: Option<String>,
    verbosity: VerbosityLevel,
    write_older_cache_files: bool,
) -> Result<Vec<String>>

Returns the added service names