message: Add more example in README
diff: @@ -254,12 +254,23 @@ NOTE: `stat` command is not supported. Because servers are running in the same p
  # Start it just with --manager-address command line parameter
  ssmanager --manager-address "127.0.0.1:6100"
  +# For *nix system, manager can bind to unix socket address
  +ssmanager --manager-address "/tmp/shadowsocks-manager.sock"
  +
  # You can also provide a configuration file
  #
  # `manager_address` key must be provided in the configuration file
  ssmanager -c /path/to/shadowsocks.json
  +
  +# Create one server by UDP
  +echo '{"add":{"server_port":8388,"password":"hello-kitty"}}' | nc -u '127.0.0.1' '6100'
  +
  +# Close one server by unix socket
  +echo '{"remove":{"server_port":8388}}' | nc -Uu '/tmp/shadowsocks-manager.sock'
  ```
  +For manager UI, check more details in the [shadowsocks-manager](https://github.com/shadowsocks/shadowsocks-manager) project.
  +
  Example configuration:
  ```jsonc
  