feat(examples): add example playing sointu tracks from Python (#108)

* Added Python code example.
* Added pyinstaller build.
* Clarified debugging steps in README.md.
* Added linux implementation.
* Cosmetics.
* Updated README with correct steps.

examples/code/Python/sointu_python/__main__.py

@@ -0,0 +1,16 @@
+from sointu import (
+    play_song,
+    playback_position,
+    playback_finished,
+    sample_rate,
+    track_length,
+)
+from sys import exit
+
+if __name__ == '__main__':
+    play_song()
+
+    while not playback_finished():
+        print("Playback time:", playback_position() / sample_rate())
+
+    exit(0)