update README: add link to encryption methods

README.md

@@ -63,7 +63,7 @@ Explanation of the fields:
 | local_port    | local port                                      |
 | password      | password used for encryption                    |
 | timeout       | in seconds                                      |
-| method        | encryption method, "aes-256-cfb" is recommended |
+| method        | default: "aes-256-cfb", see [Encryption]        |
 | fast_open     | use [TCP_FASTOPEN], true / false                |
 | workers       | number of workers, available on Unix/Linux      |
 
@@ -121,6 +121,7 @@ Bugs and Issues
 [Chinese Readme]:    https://github.com/clowwindy/shadowsocks/wiki/Shadowsocks-%E4%BD%BF%E7%94%A8%E8%AF%B4%E6%98%8E
 [Chrome Standalone]: https://support.google.com/installer/answer/126299
 [Debian sid]:        https://packages.debian.org/unstable/python/shadowsocks
+[Encryption]:        https://github.com/clowwindy/shadowsocks/wiki/Encryption
 [iOS]:               https://github.com/shadowsocks/shadowsocks-iOS/wiki/Help
 [Issue Tracker]:     https://github.com/clowwindy/shadowsocks/issues?state=open
 [Mailing list]:      http://groups.google.com/group/shadowsocks