Add README and inventory example.

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+#openshift_cluster_metrics
+
+This role configures Cluster wide metrics. It does setting up three services:
+* Metrics are stored in InfluxDB for querying.
+* Heapster reads all nodes and pods from the master, then connects to eachs node's kubelet to retrieve pod metrics.
+* Grafan allows users to create dashboards of metrics from InfluxDB
+
+## Requirements
+
+Running OpenShift cluster
+
+## Role Variables
+
+```
+# Enable cluster metrics
+use_cluster_metrics=true
+```
+
+## Dependencies
+
+None
+
+## Example Playbook
+
+TODO
+
+## Security Note
+Opening up the read-only port exposes information about the running pods (such as namespace, pod name, labels, etc.) to unauthenticated clients. The requirement to open up this read-only port will be fixed in future versions.
+
+##License
+
+Apache License, Version 2.0
+
+## Author Information
+
+Diego Castro (diego.castro@getupcloud.com)