Feat: Added purchase class (commit method not fully implemented)

src/main/java/edu/ntnu/idi/idatt2003/g40/mappe/Purchase.java

@@ -0,0 +1,31 @@
+package edu.ntnu.idi.idatt2003.g40.mappe;
+
+/**
+ * Purchase represents purchases the player commits.
+ *
+ * <p>Extends {@link Transaction}</p>
+ *
+ * */
+public class Purchase extends Transaction {
+
+  /**
+   * Constructor.
+   *
+   * @param share the {@link Share} object to purchase.
+   * @param week the week to purchase during.
+   * @param calculator the {@link TransactionCalculator} object to calculate this purchase.
+   * */
+  public Purchase(final Share share, final int week, final TransactionCalculator calculator) {
+    super(share, week, calculator);
+  }
+
+  /**
+   * Commits the purchase.
+   *
+   * @param player the {@link Player} object performing the purchase.
+   * */
+  @Override
+  public void commit(final Player player) {
+    commited = true;
+  }
+}