add category

walterbender · walterbender · commit 759932840ccd · 2015-02-14T17:23:02.000-05:00
diff --git a/activity/activity.info b/activity/activity.info
@@ -8,3 +8,4 @@ show_launcher = yes
 license = GPLv3+
 single_instance = yes
 summary = scaled images of a ruler, protractor, and a checker board
+category = science maths
