update services

README.md

@@ -13,13 +13,25 @@ Topic is only limited to **Features** and **Bugs**.
 
 Please do **NOT** open an issue if you don't know usages of the services or you need other helps. You should ask these questions in our [mailing list](http://groups.google.com/group/ustc_lug).
 
-Servers refer to:
+Services refer to:
 
 * [Mirrors](https://mirrors.ustc.edu.cn)
+* [DNS](dns.lug.ustc.edu.cn)
 * [PXE](http://pxe.ustc.edu.cn)
 * [Gitlab](https://git.ustclug.org)
 * [Freeshell](https://freeshell.ustc.edu.cn)
 * [Blog](https://blog.ustc.edu.cn)
+* [Light](https://light.ustclug.org)
+* [VPN](https://getvpn.ustclug.org)
+* [FTP](https://ftp.ustclug.org)
+* [GPG Key Server](https://sks.ustclug.org)
+* [BBS](https://bbs.ustclug.org)
+* [LUGI VPN](board.ustclug.org) (internal)
+* [LDAP](https://ldap.lug.ustc.edu.cn) (internal)
+* [Server Status](https://status.ustclug.org) (internal)
 
-* * *
-LUG@USTC
+
+***
+
+
+LUG@USTC