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

producer-consumer/README.md

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+---
+layout: pattern
+title: Producer Consumer
+folder: producer-consumer
+permalink: /patterns/producer-consumer/
+categories: Concurrency
+tags:
+ - Java
+ - Difficulty-Intermediate
+ - I/O
+---
+
+## Intent
+Producer Consumer Design pattern is a classic concurrency pattern which reduces
+ coupling between Producer and Consumer by separating Identification of work with Execution of
+ Work.
+
+![alt text](./etc/producer-consumer.png "Producer Consumer")
+
+## Applicability
+Use the Producer Consumer idiom when
+
+* decouple system by separate work in two process produce and consume.
+* addresses the issue of different timing require to produce work or consuming work