add README

README.md

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+### TCP Relay
+
+Run this inside the GFW
+
+`$ ./relay -l 0.0.0.0:12345 -r <remote>:12345`
+
+
+Run this outside the GFW
+
+`$ ./relay -l 0.0.0.0:12345 -r <http_proxy_server>:<port>`
+
+### Changelog
+
+#### 0.0.0
+* A working encrypted TCP relay in less than 100 lines of code
+
+#### 0.0.1
+* WIP
+
+### See Also
+
+* https://github.com/jpillora/chisel
+* https://github.com/eahydra/socks