Added low battery example

apps/happyclk/README.md

@@ -10,6 +10,10 @@ A happy clock.
 - The left mouthline shows whether your bangle is locked or not
 - The right mouthline whether you reached 10k steps or not.
 
+Here you can see an example of a locked bangle with a low battery:
+
+![](screenshot_3.png)
+
 ## Creator
 - [David Peer](https://github.com/peerdavid).
 

apps/happyclk/metadata.json

@@ -11,7 +11,8 @@
   "tags": "clock",
   "screenshots": [
     {"url":"screenshot_1.png"},
-    {"url":"screenshot_2.png"}
+    {"url":"screenshot_2png"},
+    {"url":"screenshot_3.png"}
   ],
   "storage": [
     {"name":"happyclk.app.js","url":"happyclk.app.js"},