Updated index.html by adding Assignment 3

Added div for the Assignment 3 in the index.html.

Author: moizsajid

index.html

@@ -26,7 +26,14 @@
         Assignment #2: Fully-Connected Nets, Batch Normalization, Dropout,
         Convolutional Nets
       </a>
-    </div>	  
+    </div>
+	  
+    <div class="materials-item">
+      <a href="assignments2017/assignment3/">
+        Assignment #3: Image Captioning with Vanilla RNNs, Image Captioning with LSTMs, Network Visualization,
+        Style Transfer, Generative Adversarial Networks
+      </a>
+    </div>
 
     <!--
     <div class="module-header">Winter 2016 Assignments</div>