add Terraform

Terraform is awesome.  You write code to create infrastructure.  The tools themselves are modular and as such it has providers that allow creation of infrastructure in AWS, Microsoft Azure, Google Cloud Platform, Oracle, and many others.  Terraform is *the* way that companies try to build multi-cloud solutions.

README.md

@@ -168,7 +168,9 @@
 * [Rundeck](http://rundeck.org/) - Simple orchestration tool.
 * [Salt](http://saltstack.com/) - Fast, scalable and flexible systems management software written in Python/ZeroMQ.
 * [Spruce](https://github.com/geofffranks/spruce) - A tool that merges separate YAML files into one.  Works well with [Genesis](https://github.com/starkandwayne/genesis).
-* [StackStorm](https://stackstorm.com/) - Event Driven Operations and ChatOps platform for infrastructure management. Written in Python
+* [StackStorm](https://stackstorm.com/) - Event Driven Operations and ChatOps platform for infrastructure management. Written in Python.
+* [Terraform](https://www.terraform.io/) - Terraform works with many cloud providers and creates infrastructure from code.
+
 
 ## Code Review