Added a new example: follow_playlist.py (#804)

* Create playlist_all_local_tracks.py

* Delete playlist_all_local_tracks.py

* Create follow_playlist.py

examples/follow_playlist.py

@@ -0,0 +1,23 @@
+import argparse
+
+import spotipy
+from spotipy.oauth2 import SpotifyOAuth
+
+def get_args():
+    parser = argparse.ArgumentParser(description='Follows a playlist based on playlist ID')
+    parser.add_argument('-p', '--playlist', required=True, help='Playlist ID')
+    
+    return parser.parse_args()
+
+def main():
+    args = get_args()
+    
+    if args.playlist is None:
+      # Uses the Spotify Global Top 50 playlist
+      spotipy.Spotify(auth_manager=SpotifyOAuth()).current_user_follow_playlist('37i9dQZEVXbMDoHDwVN2tF')
+      
+    else:
+      spotipy.Spotify(auth_manager=SpotifyOAuth()).current_user_follow_playlist(args.playlist)
+    
+if __name__ == '__main__':
+    main()