docs: write an initial statement for the repo

README.md

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+# understack
+
+An opinionated installation of OpenStack and related services to
+be able to provision bare metal hardware to be consumable by
+[genestack](https://github.com/rackerlabs/genestack) for the
+full OpenStack suite.
+
+The requirements are a Kubernetes cluster, which
+this repo will contain information about building different
+clusters and then a pile of bare metal systems that can
+be ingested into the stack to be available to be consumed
+via Openstack Ironic.