Add multiple accounts example, solves #446

examples/multiple_accounts.py

@@ -0,0 +1,10 @@
+import spotipy
+import spotipy.util as util
+
+from pprint import pprint
+
+while True:
+    username = input("Type the Spotify user ID to use: ")
+    token = util.prompt_for_user_token(username, show_dialog=True)
+    sp = spotipy.Spotify(token)
+    pprint(sp.me())