Added TIS to the current users

README.md

@@ -61,6 +61,7 @@ Wakame-vdc is currently used by the following companies.
   - [NTT PC Web Arena VPS Cloud](http://web.arena.ne.jp/vps-cloud/)
 * Kyocera Communication Systems Co., Ltd. ( http://www.kccs.co.jp/english/ )
   - [KCCS GreenOffice Unified Cloud](https://gouc.datacenter.ne.jp)
+* [TIS Inc.](http://www.tis.com/)
 
 If you already use this software, please let us know. Thank you.