all index.md files renamed to README.md for more compatibility with github

servant/README.md

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+---
+layout: pattern
+title: Servant
+folder: servant
+permalink: /patterns/servant/
+categories: Structural
+tags:
+ - Java
+ - Difficulty-Beginner
+---
+
+## Intent
+Servant is used for providing some behavior to a group of classes.
+Instead of defining that behavior in each class - or when we cannot factor out
+this behavior in the common parent class - it is defined once in the Servant.
+
+![alt text](./etc/servant-pattern.png "Servant")
+
+## Applicability
+Use the Servant pattern when
+
+* when we want some objects to perform a common action and don't want to define this action as a method in every class.
+
+## Credits
+* [Let's Modify the Objects-First Approach into Design-Patterns-First](http://edu.pecinovsky.cz/papers/2006_ITiCSE_Design_Patterns_First.pdf)