Written javadoc for many classes

Signed-off-by: Rogiel <rogiel@rogiel.com>

src/main/java/com/l2jserver/service/Service.java

@@ -1,5 +1,11 @@
 package com.l2jserver.service;
 
+/**
+ * Each Service is a provider of a given feature. Most services will want to
+ * implement {@link AbstractService} class instead of this interface.
+ * 
+ * @author <a href="http://www.rogiel.com">Rogiel</a>
+ */
 public interface Service {
 	/**
 	 * Start this service