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

adapter/README.md

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+---
+layout: pattern
+title: Adapter
+folder: adapter
+permalink: /patterns/adapter/
+categories: Structural
+tags:
+ - Java
+ - Gang Of Four
+ - Difficulty-Beginner
+---
+
+## Also known as
+Wrapper
+
+## Intent
+Convert the interface of a class into another interface the clients
+expect. Adapter lets classes work together that couldn't otherwise because of
+incompatible interfaces.
+
+![alt text](./etc/adapter.png "Adapter")
+
+## Applicability
+Use the Adapter pattern when
+
+* you want to use an existing class, and its interface does not match the one you need
+* you want to create a reusable class that cooperates with unrelated or unforeseen classes, that is, classes that don't necessarily have compatible interfaces
+* you need to use several existing subclasses, but it's impractical to adapt their interface by subclassing every one. An object adapter can adapt the interface of its parent class.
+
+## Real world examples
+
+* [java.util.Arrays#asList()](http://docs.oracle.com/javase/8/docs/api/java/util/Arrays.html#asList%28T...%29)
+
+## Credits
+
+* [Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)
+* [J2EE Design Patterns](http://www.amazon.com/J2EE-Design-Patterns-William-Crawford/dp/0596004273/ref=sr_1_2)