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

twin/README.md

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+---
+layout: pattern
+title: Twin
+folder: twin
+permalink: /patterns/twin/
+categories: Creational
+tags:
+ - Java
+ - Difficulty-Intermediate
+---
+
+## Intent
+ Twin pattern is a design pattern which provides a standard solution to simulate multiple
+inheritance in java
+
+![alt text](./etc/twin.png "Twin")
+
+## Applicability
+Use the Twin idiom when
+
+* to simulate multiple inheritance in a language that does not support this feature.
+* to avoid certain problems of multiple inheritance such as name clashes.
+
+## Credits
+
+* [Twin – A Design Pattern for Modeling Multiple Inheritance](http://www.ssw.uni-linz.ac.at/Research/Papers/Moe99/Paper.pdf)