Java doc update

Author: FcoJoseBernalPerez

src/main/java/coreapi/OrderFactory.java

@@ -1,5 +1,6 @@
 /**
  * @author Borja
+ * @author María
  * @version 0.2
  * @see Order
  */

src/main/java/coreapi/OrderService.java

@@ -1,3 +1,8 @@
+/**
+ *  @author María
+ *  @version 0.2
+ */
+
 package coreapi;
 
 import java.math.BigDecimal;

src/main/java/coreapi/Product.java

@@ -1,11 +1,33 @@
+/**
+ * @author Fran
+ * @version 0.2
+ */
+
 package coreapi;
 
 import java.math.BigDecimal;
 
 public interface Product {
 
+	/**
+	 * Returns the unique id assigned by the product catalog to this specific catalog.
+	 * @return returns the id of this product.
+	 * @see ProductCatalog
+	 */
 	public int getId();
+	
+	/**
+	 * Returns the price of this product as a <code>BigDecimal</code> to avoid precision loss.
+	 * @return returns the price of this product.
+	 * @see BigDecimal
+	 */
 	public BigDecimal getPrice();
+	
+	/**
+	 * Returns the name assigned by the product catalog to this specific catalog.
+	 * @return returns the name of this product.
+	 * @see ProductCatalog
+	 */
 	public String getName();
 
 }