widhid: add README

apps/widhid/README.md

@@ -0,0 +1,21 @@
+# Description
+
+A music control widget based on [Swipe Bluetooth Music Controls] (based on [Bluetooth Music Controls]).
+By operating as a widget, you can control music without leaving your current app (e.g. on a run, bike ride or just watching the clock).
+
+
+[Swipe Bluetooth Music Controls]: https://github.com/espruino/BangleApps/tree/master/apps/hidmsicswipe
+[Bluetooth Music Controls]: https://github.com/espruino/BangleApps/tree/master/apps/hidmsic
+
+# Usage
+
+Swipe down to enable - note the icon changes from blue to orange, indicating it's listening for your instruction. Then drag up/down for volume, left/right for previous and next and tap for play/pause.
+
+All other watch interaction is disabled for 3 seconds, to prevent clashing taps/drags - this period is extended as you continue to alter the volume, play/pause and jump between tracks.
+
+
+# Setup / Technical details
+
+Note that HID must be enabled in settings. Then provided you're paired with your phone/computer, the widget icon will appear and you can control music from your clock face!
+
+The app disables all other drag and tap handlers while this widget is "active" (in a similar manner to [`backswipe`](https://github.com/espruino/BangleApps/pull/2524#issuecomment-1406230564) and [`lightswitch`](https://github.com/espruino/Espruino/issues/2151#issuecomment-1042423211)).

apps/widhid/metadata.json

@@ -5,6 +5,7 @@
   "version": "0.01",
   "description": "Based on Swipe Bluetooth Music Controls (based on Bluetooth Music Controls). Swipe down to enable, then swipe up/down for volume, left/right for previous and next and tap for play/pause. Enable HID in settings, pair with your phone/computer, then use this widget to control music from your watch!",
   "icon": "icon.png",
+  "readme": "README.md",
   "tags": "widget,bluetooth",
   "supports": ["BANGLEJS2"],
   "storage": [