#677 init folder for pattern trampoline

trampoline/README.md

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+---
+layout: pattern
+title: Trampoline
+folder: trampoline
+permalink: /patterns/trampoline/
+categories: Behavior
+tags:
+ - Java
+ - Difficulty-Intermediate
+ - Performance
+ - Recursion
+---
+
+## Intent
+By representing a computation in one of 2 states 
+(completed with result, or a reference to the reminder of the computation, 
+something like the way a java.util.Supplier does) 
+it is possible to implement algorithms recursively in Java without blowing the stack 
+and to interleave the execution of functions without hard coding them together or even using threads.
+
+
+
+## Applicability
+Use the Trampoline pattern when
+
+* For implementing tail recursive function. This pattern allows to switch on a stackless operation.
+* For to interleaving the execution of two or more functions on the same thread.
+
+## Known uses(real world examples)
+* Trampoline refers to using reflection to avoid using inner classes, for example in event listeners. 
+The time overhead of a reflection call is traded for the space overhead of an inner class. 
+Trampolines in Java usually involve the creation of a GenericListener to pass events to an outer class.
+
+## Credits
+
+* [Trampolining: a practical guide for awesome Java Developers](https://medium.com/@johnmcclean/trampolining-a-practical-guide-for-awesome-java-developers-4b657d9c3076)
+* [Trampoline in java ](http://mindprod.com/jgloss/trampoline.html)
+