Add the contact estimation paper

Author: ubgk

index.html

@@ -14,6 +14,7 @@
             <li><a href="publications/loik-solver"> Low complexity differential inverse kinematics solver.</a></li>
             <li><a href="https://arxiv.org/abs/2304.06372"> Analysis of contact models in robotics.</a></li>
             <li><a href="https://hal.science/hal-04438175/"> About limitations and extensions of RaiSim simulator.</a></li>
+            <li><a href="https://hal.science/hal-04726386/"> A data-driven contact estimation method for wheeled-biped robots.</a></li>
         </ul> 
     </body>
-</html>
+</html>