Add ROADMAP.md

Signed-off-by: Yi Chen <[email protected]>

Author: ChenYi015

ROADMAP.md

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+# Spark Operator ROADMAP
+
+## 2025
+
+- [x] A new CR to support Spark Connect ([#2569](https://github.com/kubeflow/spark-operator/pull/2569))
+- [x] Cert manger support ([#1178](https://github.com/kubeflow/spark-operator/issues/1178))
+- [ ] Improve controller performance
+- [ ] Rest API for submitting jobs
+- [ ] Deprecation of webhook by moving all functionality into the pod template ([#2502](https://github.com/kubeflow/spark-operator/issues/2502))
+- [ ] Watching namespaces based on labels
+- [ ] A web UI for visibility into currently running applications
+- [ ] Doc improvement
+
+## 2024
+
+- [x] Pod template support ([#2101](https://github.com/kubeflow/spark-operator/issues/2101))
+- [x] Spark Connect Support ([#1801](https://github.com/kubeflow/spark-operator/issues/1801))
+- [x] Support Yunikorn as a batch scheduler ([#2107](https://github.com/kubeflow/spark-operator/pull/2107))
+- [x] Improve test coverage to improve the confidence in releases, particularly with e2e tests