docs: add SUPPORT.md with APIM-focused support guidance

Closes #0

Author: Copilot

SUPPORT.md

@@ -0,0 +1,25 @@
+## How to file issues and get help
+
+### GitHub issues
+
+We use [GitHub Issues](https://github.com/Azure/apiops-cli/issues/new/choose) to track bugs, questions, and feature requests. GitHub issues are free, but **response time is not guaranteed.**
+
+To keep our issue queue focused and actionable, issues that have had no activity for **30 days** will be automatically closed. If you still need help after an issue is closed, feel free to open a new one with a link to the original.
+
+### Azure API Management resources
+
+- Browse the [Azure API Management documentation](https://learn.microsoft.com/azure/api-management/)
+- Search for similar issues in [our GitHub repository](https://github.com/Azure/apiops-cli/issues)
+- Ask a question on [Microsoft Q&A](https://learn.microsoft.com/answers/tags/28/azure-api-management) and tag it with `azure-api-management`
+- Ask a question at [Microsoft Tech Community — API Management](https://techcommunity.microsoft.com/t5/azure-paas-blog/bg-p/AzurePaaSBlog/label-name/Azure%20API%20Management)
+- Share or upvote feature requests on the [Azure Feedback Portal](https://feedback.azure.com/d365community/forum/e50fd0ca-5525-ec11-b6e6-000d3a4f0f84) (Azure API Management category)
+
+### Security bugs
+
+Security issues and bugs should be reported privately. Please review [SECURITY.md](SECURITY.md) for details on how to responsibly disclose security vulnerabilities.
+
+## Support Policy
+
+**apiops-cli is an open-source tool** provided as-is under the MIT License. It is not covered by any Azure or Microsoft commercial support plan.
+
+Community support is available through GitHub Issues. For Azure API Management service-level questions unrelated to this tool, please use the channels listed above or open an [Azure support ticket](https://azure.microsoft.com/support/create-ticket/) if you have an Azure support plan.