doc: README.md

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 # echo-ip
 usage:
 Start the server. Default: bind address 0.0.0.0 and port 8888.
 ```
 ./echo-ip -l 0.0.0.0 -p 8888
 ```
 Send a HTTP request to the server, and you will receive an echo for you IP address.
 ```
 curl 10.20.30.40:8888
 ```