fixes import and added docstring

src/pyjack/card.py

@@ -17,6 +17,7 @@ class Card:
             self.value = int(rank)
 
     def __str__(self) -> str:
+        """Returns the rank and suit of the card."""
         return self.rank + " of " + self.suit
 
     def get_value(self) -> int:

src/pyjack/deck.py

@@ -1,5 +1,5 @@
 import random
-from card import Card
+from pyjack.card import Card
 
 SUITS = ["hearts", "diamonds", "clubs", "spades"]
 RANKS = list(range(2, 11)) + ["J", "Q", "K", "A"]