add todo

index.html

@@ -246,6 +246,7 @@ <h3>Overview</h3>
 								<li>Asymmetric read-write load (lots of writes, very little reads)</li>
 								<li>Asymmetric APIs (read operations require computed outputs, message/command-driven write APIs)</li>
 								<li>...all benefit from separate models</li>
+								<li>TODO: mention CQS</li>
 							</li>
 						</aside>
 					</section>