add initial portfolio implementation

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/Model/Portfolio.java

@@ -1,4 +1,50 @@
 package edu.ntnu.idi.idatt2003.gruppe42.Model;
 
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Portfolio represents a collection of {@link Share} objects owned by a {@link Player}.
+ * The class includes methods for adding, removing and getting shares from the portfolio.
+ */
 public class Portfolio {
+  private List<Share> shares;
+
+  /**
+   * The constructor of the {@link Portfolio} class.
+   */
+  public Portfolio() {
+    this.shares = new ArrayList<>();
+  }
+
+  /**
+   * Method for adding a share to a portfolio.
+   * @param share represents the share to be added to the portfolio.
+   * @return true or false based on if the operation was successful or not.
+   */
+  public boolean addShare(Share share) {
+    return true;
+  }
+
+  /**
+   * Method for removing a share to a portfolio.
+   * @param share represents the share to be removed from the portfolio.
+   * @return true or false based on if the operation was successful or not.
+   */
+  public boolean removeShare(Share share) {
+    return false;
+  }
+
+  public List<Share> getShares() {
+    return this.shares;
+  }
+
+  /**
+   * Method for checking if a portfolio contains a given share.
+   * @param share represents the share to be checked.
+   * @return true or false based on if the share was found or not.
+   */
+  public boolean contains(Share share) {
+    return true;
+  }
 }