health: add hrm info to readme

reference:

> The health app on the Bangle only stores data every 10 minutes. The '3 minute' option is for the heart rate - it'll take 3 HRM samples every 10 minute slot and use the best/average value of HRM readings - but it only stores one reading per 10 minutes.

https://forum.espruino.com/conversations/386312/#comment16972306
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@ -4,7 +4,7 @@ Logs health data to a file in a defined interval, and provides an app to view it
## Usage
Once installed, health data is logged automatically.
Once installed, health data is logged automatically. Entries are stored with a 10 minute interval.
To view data, run the `Health` app from your watch.
@ -40,6 +40,8 @@ minifier used in the App Loader, so we use the closure compiler to pre-minify th
The easiest way to use it is to install `https://github.com/espruino/EspruinoDocs`
and run `EspruinoDocs/bin/minify.js lib.js lib.min.js`
HRM data is stored as a number representing the best/average value from a 10 minute period.
## TODO
* `interface` page for desktop to allow data to be viewed and exported in common formats