Added readme binding to metadata

Author: voloved

apps/jsonclock/metadata.json

@@ -3,7 +3,8 @@
   "version": "0.01",
   "description": "JSON view of the time, date, steps, battery, and sunrise and sunset times",
   "icon": "app.png",
-  "screenshots": [{"url":"app.png"}],
+  "screenshots": [{"url":"dark-emulator.png"}],
+  "readme": "README.md",
   "type": "clock",
   "tags": "clock",
   "supports": ["BANGLEJS","BANGLEJS2"],