Create support.md

Author: andyzhangx

support.md

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+# Support
+
+## How to file issues and get help
+
+This project uses GitHub Issues to track bugs and feature requests. Please search the [existing issues][github-issues] before filing new issues to avoid duplicates. For new issues, file your bug or feature request as a new Issue.
+
+For help and questions about using this project, please:
+
+  - Read the [documentation][docs]
+  - Join us on the [#provider-azure][provider-azure-slack] Slack channel
+
+This project maintainers will respond to the best of their abilities.
+
+[provider-azure-slack]: https://kubernetes.slack.com/archives/C5HJXTT9Q
+[docs]: https://github.com/kubernetes-sigs/blob-csi-driver/tree/master/docs
+[github-issues]: https://github.com/kubernetes-sigs/blob-csi-driver/issues
+
+## Microsoft Support Policy
+
+Support for this project is limited to the resources listed above.