Update README.md

Author: NadavMozeson

README.md

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 Implementations of Design Patterns in Java
 
 **Creational patterns:** Singleton, Factory Method, Abstract Factory, Builder, Prototype
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 **Structural patterns** Delegator, Adapter, Proxy, Bridge, Decorator
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 **Behavioral patterns** Iterator, Memento, State, Chain of Responsibility, Visitor, Mediator, Strategy, Callback, Observer
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 **Concurrency patterns** Adapter in concurrency, Observer (Listener), Thread Pool, Thread-safe singleton, Double-Checked Lock-DCL, Read/Write Lock, Leader/Followers