Add empire blueprint README

conf/empire/README.md

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+# 'production' Empire example
+
+This is meant to be a base guideline for building a production ready
+[Empire][Empire] cluster. In order to launch it, you'll want to modify the
+[example.env][example.env] to fit your needs. It's worth reading through the
+[example.env][example.env] & [empire.yaml][empire.yaml] for the comments that
+detail how things will be built. Once the env is to your liking, you can launch
+the environment by running the following command:
+
+```
+$ stacker -e conf/empire/example.env -r <region> <namespace> conf/empire/empire.yaml
+```
+
+Right now it takes around 20-30 minutes to finish bringing up the entire
+environment due largely to how long it takes RDS to build the Empire database.
+
+Rather than use the ECS Container AMI that Amazon provides, the Empire team
+has built their own [Empire AMI][empire_ami] based on Ubuntu 14.04.
+
+[Empire]: https://github.com/remind101/empire/
+[example.env]: https://github.com/remind101/stacker/blob/master/conf/empire/example.env
+[empire.yaml]: https://github.com/remind101/stacker/blob/master/conf/empire/empire.yaml
+[empire_ami]: https://github.com/remind101/empire_ami