doc: Add despotify user documentation

doc/user.xml

@@ -642,6 +642,67 @@ cd mpd-version</programlisting>
           disc in the default drive.
         </para>
       </section>
+
+      <section>
+        <title><varname>despotify</varname></title>
+
+        <para>
+          Plays <ulink url="http://www.spotify.com">Spotify</ulink> tracks using the despotify
+          library. The despotify plugin uses a <filename>spt://</filename> URI and a Spotify
+          URL. So for example, you can add a song with:
+        </para>
+        
+        <para>
+          <filename>mpc add spt://spotify:track:5qENVY0YEdZ7fiuOax70x1</filename>
+        </para>
+        
+        <para>
+          You need a Spotify premium account to use this plugin, and you need
+          to setup username and password in the configuration file. The
+          configuration settings are global since the despotify playlist plugin
+          use the same settings.
+        </para>
+
+        <informaltable>
+          <tgroup cols="2">
+            <thead>
+              <row>
+                <entry>Setting</entry>
+                <entry>Description</entry>
+              </row>
+            </thead>
+            <tbody>
+              <row>
+                <entry>
+                  <varname>despotify_user</varname>
+                </entry>
+                <entry>
+                  Sets up the Spotify username (required)
+                </entry>
+              </row>
+              <row>
+                <entry>
+                  <varname>despotify_password</varname>
+                </entry>
+                <entry>
+                  Sets up the Spotify password (required)
+                </entry>
+              </row>
+              <row>
+                <entry>
+                  <varname>despotify_high_bitrate</varname>
+                </entry>
+                <entry>
+                  Set up if high bitrate should be used for Spotify tunes.
+                  High bitrate sounds better but slow systems can have problems
+                  with playback (default yes).
+                </entry>
+              </row>
+            </tbody>
+          </tgroup>
+        </informaltable>
+      </section>
+
     </section>
 
     <section>
@@ -1700,6 +1761,27 @@ cd mpd-version</programlisting>
           playlist files.
         </para>
       </section>
+
+      <section>
+        <title><varname>despotify</varname></title>
+
+        <para>
+          Adds <ulink url="http://www.spotify.com/">Spotify</ulink>
+          playlists. Spotify playlists use the <filename>spt://</filename> URI,
+          and a Spotify playlist URL. So for example, you can load a playlist
+          with
+        </para>
+        
+        <para>
+          <filename>mpc load spt://spotify:user:simon.kagstrom:playlist:3SUwkOe5VbVHysZcidEZtH</filename>
+        </para>
+        
+        <para>
+          See the despotify input plugin for configuration options (username
+          and password needs to be setup)
+        </para>
+      </section>
+
     </section>
   </chapter>
 </book>