Create ROADMAP.md

Initial RKE2 Roadmap

ROADMAP.md

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+Roadmap
+---
+This represents the larger, bigger impact features and enhancements we have planned for RKE2. There are many more tactical enhancements and fixes that can be found by perusing our [GitHub milestones](https://github.com/rancher/rke2/milestones).
+
+
+v1.20 - TBD
+---
+- Update to v1.20 Kubernetes
+
+v1.21 - TBD
+---
+- Introduce support for Cilium CNI
+- Migrate to using upstream’s kubelet certificate rotation rather than our own custom logic
+- Migrate to using the kubelet config file for configuring kubelets rather than command line args
+
+Backlog
+---
+- Embedded container image registry
+- Windows support