recorder: add bangle auther info

Author: bobrippling

apps/recorder/interface.html

@@ -414,6 +414,12 @@
   const gpx = `<?xml version="1.0" encoding="UTF-8"?>
 <gpx creator="Bangle.js" version="1.1" xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.garmin.com/xmlschemas/GpxExtensions/v3 http://www.garmin.com/xmlschemas/GpxExtensionsv3.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v1 http://www.garmin.com/xmlschemas/TrackPointExtensionv1.xsd" xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" xmlns:gpxx="http://www.garmin.com/xmlschemas/GpxExtensions/v3">
   <metadata><time>${track[0].Time.toISOString()}</time></metadata>
+  <metadata>
+    <author>
+      <name>BangleJS</name>
+      <link href="https://banglejs.com/" />
+    </author>
+  </metadata>
   <trk><name>${title}</name><trkseg>${track.map(pt => {
     // Calculate cadence (steps per minute) from step count
     // Formula: (steps in interval * 60 seconds * 1000ms) / time elapsed in ms