Append /inventory/README.md to explain what is BYO inventory folder #2742

inventory/README.md

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+# OpenShift Ansible inventory config files
+
+You can install OpenShift on:
+
+* [Amazon Web Services](aws/hosts/)
+* [BYO](byo/) (Bring your own), use this inventory config file to install OpenShift on your bare metal servers
+* [GCE](gce/) (Google Compute Engine)
+* [libvirt](libviert/hosts/)
+* [OpenStack](openstack/hosts/)