examples: Add audio player python example

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

examples/clapper-gtk/video/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_toggle_fullscreen(video, win):
+    # Since this example uses only video inside normal window, all we
+    # need to toggle fullscreen is to invert its fullscreened property
+    win.props.fullscreened ^= True
+
+def on_activate(app):
+    win = Gtk.ApplicationWindow(application=app, default_width=640, default_height=396)
+    video = ClapperGtk.Video()
+    controls = ClapperGtk.SimpleControls()
+
+    # This signal will be emitted when user requests fullscreen state change.
+    # It is app job to fullscreen video only (which might require something
+    # more than simply inverting fullscreen on the whole window).
+    video.connect('toggle-fullscreen', on_toggle_fullscreen, win)
+
+    # Create and add media for playback. First added media item to empty
+    # playback queue will be automatically selected.
+    item = Clapper.MediaItem(uri='http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4')
+    video.props.player.props.queue.add_item(item)
+
+    # Assemble window
+    video.add_fading_overlay(controls)
+    win.set_child(video)
+    win.present()
+
+    # Start playback
+    video.props.player.play()
+
+# Create a new application
+app = Adw.Application(application_id='com.example.ClapperSimple')
+app.connect('activate', on_activate)
+
+# Run the application
+app.run(None)