update readme

README.md

@@ -1,9 +1,15 @@
 Windshaft-CartoDB
 ==================
 
-This is the CartoDB map tiler.
+This is the CartoDB map tiler. It extends Windshaft with some extra functionality and custom filters for authentication
 
-Look at lib/cartodb/server_options to see how we configure windshaft
+Look at lib/cartodb/server_options for more on config
+
+* reads dbname from subdomain and cartodb redis for pretty tile urls
+* configures windshaft to publish cartodb_id as the interactivity layer
+* gets the default geometry type from the cartodb redis store
+* provides a infowindow endpoint for windshaft
+* provides a map_metadata endpoint for windshaft
 
 
 Install
@@ -15,14 +21,6 @@ node app.js [development | production]
 ```
 
 
-Core features
--------------
-* reads dbname from subdomain and cartodb redis for pretty tile urls
-* configures windshaft to publish cartodb_id as the interactivity layer
-* gets the default geometry type from the cartodb redis store
-* provides an ultra basic infowindow endpoint for windshaft
-* provides an ultra basic map_metadata endpoint for windshaft
-
 URLs
 ----
 
@@ -56,4 +54,13 @@ Args:
 * infowindow - returns contents of infowindow from CartoDB.
 
 
+**MAP METADATA**
+
+[GET] subdomain.cartodb.com/tiles/:table_name/map_metadata
+
+Args:
+
+* infowindow - returns contents of infowindow from CartoDB.
+
+
 All GET requests are wrappable with JSONP using callback argument, including the UTFGrid map tile call.