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
+```
+
+