add link to peru.do

index.html

@@ -139,6 +139,11 @@
       <a href="https://www.solidesoftware.nl">Recreated by Floris de Haan</a>
     </p>
     <p class="credits">Have any feedback? Mail me at [email protected]</p>
+    <p class="credits">
+      Also check out this
+      <a href="https://www.peru.do">mobile version of Perudo</a>!
+    </p>
+
     <div class="js-loading-screen loading-screen">
       <h1>MAMBA</h1>
       <div class="start-instructions">Druk op een toets om door te gaan</div>