Document playbook directories

playbooks/README.md

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+# openshift-ansible playbooks
+
+In summary:
+
+- [`byo`](byo) (_Bring Your Own_ hosts) has the most actively maintained
+  playbooks for installing, upgrading and performing others tasks on OpenShift
+  clusters.
+- [`common`](common) has a set of playbooks that are included by playbooks in
+  `byo` and others.
+
+And:
+
+- [`adhoc`](adhoc) is a generic home for playbooks and tasks that are community
+  supported and not officially maintained.
+- [`aws`](aws), [`gce`](gce), [`libvirt`](libvirt) and [`openstack`](openstack)
+  are related to the [`bin/cluster`](../bin) tool and its usage is deprecated.
+
+Refer to the `README.md` file in each playbook directory for more information
+about them.

playbooks/adhoc/README.md

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+# _Ad hoc_ playbooks
+
+This directory holds playbooks and tasks that really don't have a better home.
+Existing playbooks living here are community supported and not officially
+maintained.

playbooks/aws/README.md

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+# AWS playbooks
+
+This playbook directory is meant to be driven by [`bin/cluster`](../../bin),
+which is community supported and most use is considered deprecated.

playbooks/byo/README.md

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+# Bring Your Own hosts playbooks
+
+This directory has the most actively used, maintained and supported set of
+playbooks for installing, upgrading and performing others tasks on OpenShift
+clusters.
+
+Usage is documented in the official OpenShift documentation pages, under the
+Advanced Installation topic:
+
+- [OpenShift Origin: Advanced Installation](https://docs.openshift.org/latest/install_config/install/advanced_install.html)
+- [OpenShift Container Platform: Advanced Installation](https://docs.openshift.com/container-platform/latest/install_config/install/advanced_install.html)

playbooks/common/README.md

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+# Common playbooks
+
+This directory has a generic set of playbooks that are included by playbooks in
+[`byo`](../byo), as well as other playbooks related to the
+[`bin/cluster`](../../bin) tool.
+
+Note: playbooks in this directory use generic group names that do not line up
+with the groups used by the `byo` playbooks or `bin/cluster` derived playbooks,
+requiring an explicit remapping of groups.

playbooks/gce/README.md

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+# GCE playbooks
+
+This playbook directory is meant to be driven by [`bin/cluster`](../../bin),
+which is community supported and most use is considered deprecated.

playbooks/libvirt/README.md

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+# libvirt playbooks
+
+This playbook directory is meant to be driven by [`bin/cluster`](../../bin),
+which is community supported and most use is considered deprecated.

playbooks/openstack/README.md

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+# OpenStack playbooks
+
+This playbook directory is meant to be driven by [`bin/cluster`](../../bin),
+which is community supported and most use is considered deprecated.