Add supports and emulator entries

apps/smclock/metadata.json

@@ -7,6 +7,8 @@
   "description": "A simple watchface based on my stylised monogram.",
   "tags":"clock",
   "readme":"README.md",
+  "supports" : ["BANGLEJS2"],
+  "allow_emulator": true,
   "storage": [
     {"name":"smclock.app.js","url":"app.js"},
     {"name":"smclock.img","url":"app-icon.js","evaluate":true}