update preview links

Author: Moiz-CodeByte

index.html

@@ -79,6 +79,9 @@
         <div class="box">
             <a href="https://moiz-codebyte.github.io/Day%20%2311%20-%20Markdown%20Previewer/">Markdown Previewer</a>
         </div>
+        <div class="box">
+            <a href="https://moiz-codebyte.github.io/Day%20%2312%20-%202048%20Game/">2048 Game </a>
+        </div>
     </div>
 </body>
 </html>