Provided descriptions + todo for empty classes

src/main/java/de/rwu/easydrop/data/connector/DatabaseConnector.java

@@ -1,5 +1,10 @@
 package de.rwu.easydrop.data.connector;
 
+/**
+ * Allows connecting to a SQLite Database.
+ *
+ * @todo implement
+ */
 public class DatabaseConnector {
 
 }

src/main/java/de/rwu/easydrop/data/dao/ProductDAO.java

@@ -1,5 +1,10 @@
 package de.rwu.easydrop.data.dao;
 
+/**
+ * Product data access object.
+ *
+ * @todo implement
+ */
 public class ProductDAO {
 
 }

src/main/java/de/rwu/easydrop/data/model/Product.java

@@ -1,5 +1,10 @@
 package de.rwu.easydrop.data.model;
 
+/**
+ * A Product
+ *
+ * @since 0.1.0
+ */
 public class Product {
 
 }