added screenshot & README

Author: incanus

README.md

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+# MBTiles Interactivity Example
+
+This iPhone project shows a basic usage of the route-me mapping library, 
+along with its built-in support for offline-capable MBTiles map tiles, 
+together with some custom additions that allow contextual data to be 
+embedded along with the tiles on a per-pixel basis in a space-efficient 
+way. When you touch a country, you get its name and an image of its 
+flag, for the entire world, at six zoom levels, for every pixel on the 
+globe, in a 29MB data file. 
+
+More info on creating the interactivity features at: 
+
+    http://developmentseed.org/blog/2011/may/16/tilemill-020-release