Added Project Mage.

src/webring/index.md

@@ -139,4 +139,5 @@ For address helpers: go find them on [http://reg.i2p/]().
 <a href="https://shadowm00n.neocities.org/">ShadowM00n</a><br />
 <a href="https://monero.observer/">Monero Observer</a><br />
 <a href="https://www.japan-secure.com/?PageSpeed=noscript">ネットセキュリティブログ</a><br />
-<a href="https://densankiblog.wordpress.com/">電算機孝行２</a>
+<a href="https://densankiblog.wordpress.com/">電算機孝行２</a><br />
+<a href="https://project-mage.org/">Project Mage</a>