add javadoc to Stock and Share class

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

@@ -2,11 +2,24 @@
 
 import java.math.BigDecimal;
 
+/**
+ * Represents a share of a particular stock owned by a player.
+ * <p>
+ * A {@code Share} keeps track of the stock it represents, the quantity owned,
+ * and the purchase price at which it was bought.
+ * </p>
+ */
 public class Share {
   private Stock stock;
   private BigDecimal quantity;
   private BigDecimal purchasePrice;
 
+  /**
+   * Constructs a new {@code Share} given the given stock, quantity, and purchase price.
+   * @param stock stock the stock that this share represents
+   * @param quantity quantity the number of shares owned
+   * @param purchasePrice purchasePrice the price per share at the time of purchase
+   */
   public Share(Stock stock, BigDecimal quantity, BigDecimal purchasePrice) {
     this.stock = stock;
     this.quantity = quantity;

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

@@ -4,11 +4,24 @@
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Represents a stock of a company in the {@link Exchange}.
+ * <p>
+ * Each {@code Stock} has a unique symbol, a company name, and a history of sales prices.
+ * You can retrieve the current price or add new prices as the market changes.
+ * </p>
+ */
 public class Stock {
   private final String symbol;
   private final String company;
   private List<BigDecimal> prices = new ArrayList<>();
 
+  /**
+   * Constructs a new {@code Stock} with the given symbol, company name, and initial sales price.
+   * @param symbol symbol the unique stock symbol (e.g., "AAPL")
+   * @param company company the company name (e.g., "Apple Inc.")
+   * @param salesPrice salesPrice the initial sales price of the stock
+   */
   public Stock(String symbol, String company, BigDecimal salesPrice) {
     this.symbol = symbol;
     this.company = company;
@@ -27,6 +40,11 @@ public BigDecimal getSalesPrice() {
     return prices.get(prices.size() - 1);
   }
 
+  /**
+   * Adds a new sales price to the stock's price history.
+   *
+   * @param salesPrice the new sales price to add
+   */
   public void addNewSalesPrices(BigDecimal salesPrice) {
     prices.add(salesPrice);
   }