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

object-pool/README.md

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+---
+layout: pattern
+title: Object Pool
+folder: object-pool
+permalink: /patterns/object-pool/
+categories: Creational
+tags:
+ - Java
+ - Difficulty-Beginner
+ - Performance
+---
+
+## Intent
+When objects are expensive to create and they are needed only for
+short periods of time it is advantageous to utilize the Object Pool pattern.
+The Object Pool provides a cache for instantiated objects tracking which ones
+are in use and which are available.
+
+![alt text](./etc/object-pool.png "Object Pool")
+
+## Applicability
+Use the Object Pool pattern when
+
+* the objects are expensive to create (allocation cost)
+* you need a large number of short-lived objects (memory fragmentation)