Added Share class

src/main/java/Share.java

@@ -0,0 +1,27 @@
+import java.math.BigDecimal;
+
+public class Share {
+
+    private final Stock stock;
+    private final BigDecimal quantity;
+    private final BigDecimal purchasePrice;
+
+    public Share(Stock stock, BigDecimal quantity, BigDecimal purchasePrice) {
+        this.stock = stock;
+        this.quantity = quantity;
+        this.purchasePrice = purchasePrice;
+    }
+
+    public Stock getStock() {
+        return stock;
+    }
+
+    public BigDecimal getQuantity() {
+        return quantity;
+    }
+
+    public BigDecimal getPurchasePrice() {
+        return purchasePrice;
+    }
+
+}