Create SUPPORT.md with support guidelines

Added support guidelines including issue filing, project maintenance status, and important notices regarding accessibility.

Author: cehfisher

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 before filing new issues to avoid duplicates. For new issues, file your bug or feature request as a new issue.
+
+For help or questions about using this project, please open an issue for support requests, usage questions, or general inquiries. At this time, GitHub Discussions are not enabled. All communication should occur via issues.
+
+## Project Maintenance Status
+
+This repo `continuous-ai-for-accessibility-scanner` is under active development and maintained by GitHub staff during the private preview state. We will do our best to respond to support, feature requests, and community questions in a timely manner.
+
+## Important Notice
+
+This project is a work in progress, and we do not guarantee that code fixes or suggestions produced by Copilot will be fully accessible. Please use caution when applying the suggestions it provides. Always confirm or verify Copilot's recommendations with an accessibility subject matter expert before using them in production.
+
+## GitHub Support Policy
+
+Support for this project is limited to the resources listed above (GitHub Issues).