add documentation

README.md

@@ -46,9 +46,12 @@ CKAN version | Compatibility
 
 ### Configuration
 
-_TODO: what configuraiton options exist?_
+[Optional]
+`ckanext.datagovtheme.js_recent_view = true`
 
 
+This defaults to `false`. If displaying the recent view count slows down page loading, the optional parameter can be set to `true` to make the recent view count an AJAX call, improving page loading speed.
+
 ## Development
 
 ### Requirements