Add SUPPORT.md routing questions to issues, email, and the PowerShell Gallery

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

SUPPORT.md

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+# Support
+
+## This module
+
+Use the issues on this repository for bugs, feature requests, and questions about the module.
+Search the existing issues first, the answer may already be there.
+
+For anything that does not belong in a public issue, send an email to [psmodule@psmodule.io](mailto:psmodule@psmodule.io).
+
+Do not use issues to report security vulnerabilities. Follow [`SECURITY.md`](SECURITY.md) instead.
+
+## PowerShell Gallery
+
+Problems with the PowerShell Gallery itself, such as package listings, downloads, or accounts, belong with the Gallery maintainers:
+
+- [PowerShell/PowerShellGallery issues](https://github.com/PowerShell/PowerShellGallery/issues)
+- [cgadmin@microsoft.com](mailto:cgadmin@microsoft.com)
+
+## Fixing it yourself
+
+Contributions are welcome. Read [`CONTRIBUTING.md`](CONTRIBUTING.md) to get started.