#354 Add maven model for feature toggle design pattern

twin/index.md

@@ -9,16 +9,18 @@ tags:
  - Difficulty-Intermediate
 ---
 
-**Intent:**  Twin pattern is a design pattern which provides a standard solution to simulate multiple
+## 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
+## 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:**
+## Credits
 
 * [Twin – A Design Pattern for Modeling Multiple Inheritance](http://www.ssw.uni-linz.ac.at/Research/Papers/Moe99/Paper.pdf)