Object pool markdown.

creational/object_pool.md

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+# Object Pool Pattern
+
+The [object pool design pattern](https://en.wikipedia.org/wiki/Object_pool_pattern) allows multiple instances to be kept in a collection ("pool") in order to have already been initialized when other instances are ready to use them.
+
+# Implementation and Example
+
+An example with implementation and usage can be found in [object_pool.go](object_pool.go).