[gnome-music/wip/jfelder/songlistsore-docstring] songliststore: Add missing docstrings

[Jean Felder <jfelder src gnome org>]

commit 9a200937a4f1e431f980464c0ac8d586a1d1b296
Author: Jean Felder <jfelder src gnome org>
Date:   Fri Nov 22 12:51:42 2019 +0100

    songliststore: Add missing docstrings

 gnomemusic/songliststore.py | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/gnomemusic/songliststore.py b/gnomemusic/songliststore.py
index df3c2587..dc9c94a8 100644
--- a/gnomemusic/songliststore.py
+++ b/gnomemusic/songliststore.py
@@ -7,6 +7,10 @@ import gnomemusic.utils as utils
 class SongListStore(Gtk.ListStore):
 
     def __init__(self, model):
+        """Initialize SongListStore.
+
+        :param Gio.ListStore model: The songs model to use
+        """
         super().__init__()
 
         self._model = Gfm.SortListModel.new(model)
@@ -88,4 +92,9 @@ class SongListStore(Gtk.ListStore):
     @GObject.Property(
         type=Gio.ListStore, default=None, flags=GObject.ParamFlags.READABLE)
     def model(self):
+        """Gets the model of songs sorted.
+
+        :returns: a list model of sorted songs
+        :rtype: Gfm.SortListModel
+        """
         return self._model