Add support for RADIO_BROWSER source

This implementation follows the reference from soundcork pull request #158. It adds RADIO_BROWSER to the known providers and includes the service configuration in bmx_services.json. Documentation has also been added to explain how to use the RadioBrowser feature. Credits to @gmuth (https://github.com/gmuth) for the original idea and implementation in soundcork. Reference: https://github.com/deborahgu/soundcork/pull/158

docs/SUMMARY.md

@@ -33,6 +33,7 @@
 * [Preset Management](reference/PRESET-MANAGEMENT.md)
 * [Source Selection](reference/SOURCE-SELECTION.md)
 * [Volume Controls](reference/VOLUME-CONTROLS.md)
+* [RadioBrowser](reference/radio-browser.md)
 * [Bass Controls](reference/BASS-CONTROLS.md)
 * [Key Controls](reference/KEY-CONTROLS.md)
 * [Feature Mapping](reference/FEATURE-MAPPING.md)

docs/reference/SOURCE-SELECTION.md

@@ -38,6 +38,7 @@ The Bose SoundTouch Go client provides comprehensive source selection functional
 - `IHEARTRADIO` - iHeartRadio streaming
 - `STORED_MUSIC` - Local/network stored music
 - `AIRPLAY` - Apple AirPlay (device dependent)
+- `RADIO_BROWSER` - [RadioBrowser](radio-browser.md) internet radio directory
 
 ## Client Library Usage
 

docs/reference/radio-browser.md

@@ -0,0 +1,34 @@
+## radio-browser.info
+
+- https://www.radio-browser.info is a community driven radio station database.
+- It provides an API to access the data and allows users to submit new stations or update existing ones.
+
+### Search for stations
+
+- Go to https://www.radio-browser.info and find a station you like.
+- Click on the station and copy the UUID from the URL.
+- e.g. `https://www.radio-browser.info/history/d28420a4-eccf-47a2-ace1-088c7e7cb7e0`
+
+### RADIO_BROWSER
+
+- This project supports source type RADIO_BROWSER to play radio stations.
+- Set the `location` attribute to `/stations/byuuid/{UUID}`.
+
+```xml
+<ContentItem
+  source="RADIO_BROWSER"
+  type="stationurl"
+  isPresetable="true"
+  location="/stations/byuuid/9610c454-0601-11e8-ae97-52543be04c81">
+  <itemName>RADIO_BROWSER</itemName>
+  <containerArt></containerArt>
+</ContentItem>
+```
+
+### Playing the station
+
+To start the radio stream replace `<uuid>` and `<soundtouch>` and run curl like this:
+
+```bash
+curl -d '<ContentItem source="RADIO_BROWSER" type="stationurl" location="/stations/byuuid/<uuid>"/>' <soundtouch>:8090/select
+```