Acey Ducey (Python): Add unit tests

The unit tests can be executed via:

    $ pip install pytest
    $ pytest .

Also a few more type annotations

01_Acey_Ducey/python/test_acey_ducey.py

@@ -0,0 +1,19 @@
+import io
+from unittest import mock
+
+from acey_ducey import play_game
+
+
+@mock.patch("random.shuffle")
+def test_play_game_lose(mock_random_shuffle, monkeypatch, capsys) -> None:
+    monkeypatch.setattr("sys.stdin", io.StringIO("100\n100"))
+    mock_random_shuffle = lambda n: n
+    play_game()
+    captured = capsys.readouterr()
+    assert captured.out == (
+        "You now have 100 dollars\n\n"
+        "Here are you next two cards\n King\n Ace\n\n"
+        "What is your bet?  Queen\n"
+        "Sorry, you lose\n"
+        "Sorry, friend, but you blew your wad\n"
+    )