Add link to Twitter account

index.html

@@ -5,6 +5,17 @@ Welcome.
 </p>
 <p>
 I may or may not change this web-page.
+</p>
+  <hr />
+  <p>If you are planning to 'stalk' me, I'll make it easier for you.
+  </p>
+  <p>I'm sometimes active on the following:
+    <ul>
+      <li><a href="https://mobile.twitter.com/tanphengheong">
+        Twitter, at the handle @tanphengheong
+        </a>
+      </li>
+  </ul>
   </p>
 </body>
 </html>