examples: Add audio player python example

A simple audio player made using "ClapperGtkAudio"
widget with python3 GI bindings

examples/clapper-gtk/audio/simple/python/example.py

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+#!/usr/bin/env python3
+
+import gi
+gi.require_version('Adw', '1')
+gi.require_version('Clapper', '0.0')
+gi.require_version('ClapperGtk', '0.0')
+gi.require_version('Gtk', '4.0')
+from gi.repository import Adw, Clapper, ClapperGtk, Gtk
+
+Clapper.init(None)
+
+def on_activate(app):
+    # Create our widgets.
+    win = Gtk.ApplicationWindow(application=app, title='Clapper Audio', default_width=640, default_height=96)
+    audio = ClapperGtk.Audio()
+    box = Gtk.Box(valign=Gtk.Align.CENTER, margin_start=8, margin_end=8, spacing=4)
+    prev_btn = ClapperGtk.PreviousItemButton()
+    play_btn = ClapperGtk.TogglePlayButton()
+    next_btn = ClapperGtk.NextItemButton()
+    seek_bar = ClapperGtk.SeekBar()
+
+    # Add media for playback. First media item in queue will be automatically selected.
+    item = Clapper.MediaItem(uri='https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3')
+    audio.props.player.props.queue.add_item(item)
+
+    item = Clapper.MediaItem(uri='https://www.learningcontainer.com/wp-content/uploads/2020/02/Kalimba.mp3')
+    audio.props.player.props.queue.add_item(item)
+
+    # Assemble window.
+    box.append(prev_btn)
+    box.append(play_btn)
+    box.append(next_btn)
+    box.append(seek_bar)
+    audio.set_child(box)
+    win.set_child(audio)
+    win.present()
+
+    # Not too loud. Mind the ears.
+    audio.props.player.props.volume = 0.7
+
+    # Start playback.
+    audio.props.player.play()
+
+# Create a new application.
+app = Adw.Application(application_id='com.example.ClapperAudio')
+app.connect('activate', on_activate)
+
+# Run the application.
+app.run(None)