Added icons and CSS settings for Goodreads and Skoob buttons;

index.html

@@ -130,6 +130,14 @@
         <!-- Mixer -->
         <a class="button button-mixer" href="#"><img class="icon" src="icons/mixer.svg">Mixer</a>
           <br>
+
+        <!-- Goodreads -->
+        <a class="button button-goodreads" href="#"><img class="icon" src="icons/goodreads.svg">Goodreads</a>
+          <br>
+
+        <!-- Skoob -->
+        <a class="button button-skoob" href="#"><img class="icon" src="icons/skoob.svg">Skoob</a>
+          <br>
           <br>
         <p>Build your own by forking <a href="https://littlelink.io">LittleLink</a>.</p>