Clarify when grading will be done

Author: nygrenh

introduction/index.html

@@ -82,6 +82,8 @@ <h1>How to pass the course</h1>
             <b>To be announced after the course.</b> Join the mailing list for updates!
           </p>
 
+          <p>The course will be graded after the final deadline for this course and the results will be announced on the mailing list.</p>
+
         </aside>
 
         <aside class="info">