Refactor: improve Card class

Refs #52

src/main/java/ch/unibas/dmi/dbis/cs108/casono/client/game/Card.java

@@ -4,6 +4,53 @@ package ch.unibas.dmi.dbis.cs108.casono.client.game;
  * Represents a playing card with a value and suit.
  */
 public class Card {
-    public String value;
+    private String value;
-    public String suit;
+    private String suit;
+
+    /**
+     * Constructs a Card with the specified value and suit.
+     *
+     * @param value The value of the card (e.g., 2, 3, ..., 10, J, Q, K, A).
+     * @param suit The suit of the card (e.g., Hearts, Diamonds, Clubs, Spades).
+     */
+    public Card(String value, String suit) {
+        this.value = value;
+        this.suit = suit;
+    }
+
+    /**
+     * Retrieves the value of the card.
+     *
+     * @return The value of the card.
+     */
+    public String getValue() {
+        return value;
+    }
+
+    /**
+     * Retrieves the suit of the card.
+     *
+     * @return The suit of the card.
+     */
+    public String getSuit() {
+        return suit;
+    }
+
+    /**
+     * Sets the value of the card.
+     *
+     * @param value The value to set for the card.
+     */
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+    /**
+     * Sets the suit of the card.
+     *
+     * @param suit The suit to set for the card.
+     */
+    public void setSuit(String suit) {
+        this.suit = suit;
+    }
 }