Add Radio Browser integration (#21712)

* Add Radio Browser integration

* Add information about browsing

* Update source/_integrations/radio_browser.markdown

source/_integrations/radio_browser.markdown

@@ -0,0 +1,26 @@
+---
+title: Radio Browser
+description: Instructions on how to integrate Radio Browser into Home Assistant.
+ha_category:
+  - Multimedia
+ha_release: 2022.3
+ha_iot_class: Cloud Polling
+ha_domain: radio_browser
+ha_config_flow: true
+ha_platforms:
+  - sensor
+---
+
+The Radio Browser integration allows you to use the directory of
+radio stations collected on [Radio Browser](https://www.radio-browser.info)
+in Home Assistant.
+
+All radio stations can be browsed and played via the Media panel in
+Home Assistant.
+
+Additionally, when creating automations, the "Play Media" action can be used
+to pick a station from the directory. This makes it possible to create
+an automation that e.g., starts playing your favorite radio station on your
+Cast devices.
+
+{% include integrations/config_flow.md %}