Refine the description of the functionality #35

Add description to clarify that recording is not supported.

Author: baldram

README.md

@@ -4,7 +4,8 @@ This is a PlatformIO library for the generic **[VS1053 Breakout](http://www.vlsi
 A powerful Ogg Vorbis / MP3 / AAC / WMA / FLAC / MIDI Audio Codec chip.<br/>
 Read more: [http://www.vlsi.fi/en/products/vs1053.html](http://www.vlsi.fi/en/products/vs1053.html).
 
-The library may be a base to build your own webradio player or different audio device.
+The library enables the possibility to play audio files (recording is not supported).<br />
+Eg. it may be a base to build your own webradio player or different audio device.
 
 Designed specifically to work with the **Espressif ESP8266** and **ESP32** boards.