update group assignment

docs/blogs/may15.html

@@ -177,6 +177,8 @@
             
             	<a href="../img/week13/interfaceimg3.png" data-lightbox="image-51" data-title=""><img src="../img/week13/interfaceimg3.png" class="img-fluid"></a>
          			 <span class="caption text-muted">The interface made by Gilles</span> 
+         			 
+         			 <p>The link to the full group assignment can be found <a href="http://fab.academany.org/2019/labs/ulb/#groupe_project/12_Interface_Application_Programming.html">here.</a></p>
 				  
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