feat: added copy constructor to stat

src/main/java/uulm/teamname/marvelous/gamelibrary/entities/Stat.java

@@ -36,6 +36,15 @@ public class Stat {
         this.value = value;
     }
 
+    /**
+     * Constructs a new {@link Stat} with the same values as the
+     * given {@link Stat}
+     * @param toCopy is the {@link Stat} to copy
+     */
+    public Stat(Stat toCopy) {
+        this(toCopy.type, toCopy.value, toCopy.max);
+    }
+
     public int getValue() {
         return value;
     }