added eugtk examples

eugtk/examples/resources/places_sidebar.txt

@@ -0,0 +1,29 @@
+
+namespace places_sidebar
+
+export constant txt = -- documentation copied from Gtk3 docs
+
+`<span font='bold 16'>GtkPlacesSidebar</span>
+
+GtkPlacesSidebar is a widget that displays a list of frequently-used places in the file system: 
+the user's home directory, the user's bookmarks, and volumes and drives. 
+
+This widget is used as a sidebar in GtkFileChooser and may be used by file managers and 
+similar programs.
+
+The places sidebar displays drives and volumes, and will automatically mount or unmount them 
+when the user selects them.
+
+Applications can hook to various signals in the places sidebar to customize its behavior. 
+For example, they can add extra commands to the context menu of the sidebar.
+
+While bookmarks are completely in control of the user, the places sidebar also allows individual 
+applications to provide extra shortcut folders that are unique to each application. 
+
+For example, a Paint program may want to add a shortcut for a Clipart folder. 
+You can do this with gtk_places_sidebar_add_shortcut(). 
+
+Click the Add button below to choose a folder and add it to the sidebar.
+
+`
+