restored README.md in Behavioral

Author: Dominik Liebler

Behavioral/README.md

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+# Behavioral
+
+In software engineering, behavioral design patterns are design patterns that
+identify common communication patterns between objects and realize these
+patterns. By doing so, these patterns increase flexibility in carrying out this
+communication.
+
+* [ChainOfResponsibilities](ChainOfResponsibilities) [:notebook:](http://en.wikipedia.org/wiki/Chain_of_responsibility_pattern)
+* [Command](Command) [:notebook:](http://en.wikipedia.org/wiki/Command_pattern)
+* [Iterator](Iterator) [:notebook:](http://en.wikipedia.org/wiki/Iterator_pattern)
+* [Mediator](Mediator) [:notebook:](http://en.wikipedia.org/wiki/Mediator_pattern)
+* [Memento](Memento) [:notebook:](http://en.wikipedia.org/wiki/Memento_pattern)
+* [NullObject](NullObject) [:notebook:](http://en.wikipedia.org/wiki/Null_Object_pattern)
+* [Observer](Observer) [:notebook:](http://en.wikipedia.org/wiki/Observer_pattern)
+* [Specification](Specification) [:notebook:](http://en.wikipedia.org/wiki/Specification_pattern)
+* [State](State) [:notebook:](http://en.wikipedia.org/wiki/State_pattern)
+* [Strategy](Strategy) [:notebook:](http://en.wikipedia.org/wiki/Strategy_pattern)
+* [TemplateMethod](TemplateMethod) [:notebook:](http://en.wikipedia.org/wiki/Template_method_pattern)
+* [Visitor](Visitor) [:notebook:](http://en.wikipedia.org/wiki/Visitor_pattern)