Add commit method

src/main/java/Sale.java

@@ -0,0 +1,21 @@
+import java.math.BigDecimal;
+
+public class Sale extends Transaction {
+    public Sale(Share share, int week) {
+        super(share, week, new SaleCalculator(share));
+    }
+
+    public void commit(Player player) {
+        BigDecimal price = getCalculator().calculateTotal();
+
+        if (isCommitted() || !player.getPortfolio().contains(this.getShare())) {
+            return;
+        }
+
+        player.addMoney(price);
+        player.getPortfolio().removeShare(this.getShare());
+        player.getTransactionArchive().add(this);
+
+        this.committed = true;
+    }
+}