add initial readme

Signed-off-by: Umanga Chapagain <[email protected]>

README.md

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+# ODF Multicluster Orchestrator
+
+ODF Multicluster Orchestrator is a combination of Kubernetes Operator and
+addons that work together to orchestrate OpenShift Data Foundation clusters
+spread across multiple OpenShift clusters. It leverages Red Hat Advanced
+Cluster Management for Kubernetes as it's control plane and also uses it's
+addon framework.
+
+## Requirements
+
+* [Open Cluster Management](https://github.com/open-cluster-management-io/)
+* [OpenShift Data Foundation Operator](https://github.com/red-hat-storage/odf-operator)