Added cidoku.

src/webring/index.md

@@ -111,6 +111,7 @@ For address helpers: go find them on [http://reg.i2p/]().
 <a href="http://koshka.love/"><img src="http://ass.ryocafe.site/Koshkabutton.gif" class="webring-img" alt="Koshka" /></a>
 <a href="https://randomized.neocities.org/"><img src="http://ass.ryocafe.site/digitalhallu.gif" class="webring-img" alt="Digital Hallucination" /></a>
 <a href="https://wrongthink.link/"><img src="http://ass.ryocafe.site/wrongthink.png" class="webring-img" alt="Wrongthink" /></a>
+<a href="https://cidoku.net/"><img src="http://ass.ryocafe.site/cidokunet.gif" class="webring-img" alt="cidoku" /></a>
 
 ### Without button