docs: Add note on libspotify's deprecation

README.rst

@@ -17,6 +17,24 @@ work on Linux and OS X. Windows support should be possible, but is awaiting a
 contributor with the interest and knowledge to maintain it.
 
 
+libspotify's deprecation
+========================
+
+Note that as of May 2015 libspotify is officially deprecated by Spotify and is
+no longer actively maintained.
+
+Spotify has published newer libraries intended for Android and iOS development,
+as well as web APIs to access track metadata and manage playlists. Though, for
+making apps with Spotify playback capabilities, on any other platform than
+Android and iOS, there is currently no alternative to libspotify.
+
+libspotify has been the main way of integrating with Spotify since 2009, and is
+today a part of numerous open source projects and commercial applications,
+including many receivers and even cars. There's no guarantees, but one can hope
+that the large deployment of libspotify means that the library will continue to
+work with the Spotify service for a long time into the future.
+
+
 Project resources
 =================