Add documentation

docs/plugins/playlist.rst

@@ -11,6 +11,7 @@ Then configure your playlists like this::
         auto: no
         relative_to: ~/Music
         playlist_dir: ~/.mpd/playlists
+        forward_slash: no
 
 It is possible to query the library based on a playlist by speicifying its
 absolute path::
@@ -45,3 +46,7 @@ other configuration options are:
   set it to ``playlist`` to use the playlist's parent directory or to
   ``library`` to use the library directory.
   Default: ``library``
+- **forward_slah**: Forces forward slashes in the generated playlist files.
+  If you intend to use this plugin to generate playlists for MPD on
+  Windows, set this to yes.
+  Default: Use system separator

docs/plugins/smartplaylist.rst

@@ -14,6 +14,7 @@ Then configure your smart playlists like the following example::
     smartplaylist:
         relative_to: ~/Music
         playlist_dir: ~/.mpd/playlists
+        forward_slah: no
         playlists:
             - name: all.m3u
               query: ''
@@ -96,3 +97,7 @@ other configuration options are:
   directory. If you intend to use this plugin to generate playlists for MPD,
   point this to your MPD music directory.
   Default: Use absolute paths.
+- **forward_slah**: Forces forward slashes in the generated playlist files.
+  If you intend to use this plugin to generate playlists for MPD on
+  Windows, set this to yes.
+  Default: Use system separator