* add --datadir option (not actually works yet) (#290)

Config.cpp

@@ -113,6 +113,7 @@ namespace config {
       ("log",       value<std::string>()->default_value(""),     "Logs destination: stdout, file (stdout if not set, file - otherwise, for compatibility)")
       ("logfile",   value<std::string>()->default_value(""),     "Path to logfile (stdout if not set, autodetect if daemon)")
       ("loglevel",  value<std::string>()->default_value("info"), "Set the minimal level of log messages (debug, info, warn, error)")
+      ("datadir",   value<std::string>()->default_value(""),     "Path to storage of i2pd data (RI, keys, peer profiles, ...)")
       ("host",      value<std::string>()->default_value("0.0.0.0"),     "External IP")
       ("port",      value<uint16_t>()->default_value(0),                "Port to listen for incoming connections (default: auto)")
       ("ipv6",      value<bool>()->zero_tokens()->default_value(false), "Enable communication through ipv6")

docs/configuration.md

@@ -12,6 +12,7 @@ Command line options
 * --log=                - Logs destination: stdout, file (stdout if not set, file - otherwise, for compatibility)
 * --logfile=            - Path to logfile (default - autodetect)
 * --loglevel=           - Log messages above this level (debug, *info, warn, error)
+* --datadir=            - Path to storage of i2pd data (RI, keys, peer profiles, ...)
 * --host=               - The external IP
 * --port=               - The port to listen on
 * --daemon              - Router will go to background after start