Update usecases.md

Jihye Hong · web-flow · commit b4005f74cb80 · 2017-10-30T14:42:46.000+09:00
diff --git a/usecases.md b/usecases.md
@@ -6,3 +6,6 @@
 
 * Pinterest
 * Google Calender
+
+  ![Calender screenshot which can support the spatial focus navigation](images/calender1.png)
+  ![Calender screenshot which can support the spatial focus navigation](images/calender2.png)
