Create SECURITY.md

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Contributor License Agreement

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[Copilot]

Pull request overview

Adds a repository-level SECURITY.md intended to document the project’s security policy and vulnerability reporting process.

Changes:

• Introduces SECURITY.md with sections for supported versions and vulnerability reporting.

[Copilot]

The “Supported Versions” section still contains placeholder/template guidance text. Please replace it with this repo’s actual support policy (e.g., which extension/library versions receive security fixes) or remove the section if you don’t want to commit to a versioned policy.

Suggested change

	Use this section to tell people about which versions of your project are
	currently being supported with security updates.
	| Version | Supported |
	| ------- | ------------------ |
	| 5.1.x | :white_check_mark: |
	| 5.0.x | :x: |
	| 4.0.x | :white_check_mark: |
	| < 4.0 | :x: |
	The vscode-dotnet-runtime extensions and library do not currently maintain a
	formal matrix of supported historical versions.
	Security fixes and other critical patches are generally applied only to the
	latest released version of each package in this repository. To receive
	security updates, use the most recent published versions from the Visual
	Studio Code Marketplace or npm.
	If you must use an older version, you are responsible for reviewing changes
	and backporting any fixes you require.

[Copilot]

The version table appears to use example versions (5.1.x/5.0.x/4.0.x) that don’t match this repo’s published versions (e.g., vscode-dotnet-runtime is currently 3.0.1). This can mislead users—please update the entries to reflect real supported versions, or replace the table with a statement like “only the latest Marketplace release is supported”.

Suggested change

	Use this section to tell people about which versions of your project are
	currently being supported with security updates.
	| Version | Supported |
	| ------- | ------------------ |
	| 5.1.x | :white_check_mark: |
	| 5.0.x | :x: |
	| 4.0.x | :white_check_mark: |
	| < 4.0 | :x: |
	Only the latest released versions of these extensions, as published on the Visual Studio Code Marketplace, are supported with security updates.

[Copilot]

The “Reporting a Vulnerability” section is still template text and doesn’t match this repo’s existing guidance in .github/ISSUE_TEMPLATE/security-fix.yml (report privately to MSRC at secure@microsoft.com or https://msrc.microsoft.com). Please update this section to give concrete private reporting instructions and discourage filing public GitHub issues for security reports.

Suggested change

	Use this section to tell people how to report a vulnerability.
	Tell them where to go, how often they can expect to get an update on a
	reported vulnerability, what to expect if the vulnerability is accepted or
	declined, etc.
	Security vulnerabilities should be reported privately to the Microsoft Security Response Center (MSRC). Please do not file public GitHub issues or discuss potential vulnerabilities in public forums.
	If you believe you have found a security vulnerability in this repository or any other Microsoft product or service, please contact MSRC using one of the following methods:
	- Email: [secure@microsoft.com](mailto:secure@microsoft.com)
	- Web form: <https://msrc.microsoft.com/create-report>
	Include as much detail as possible in your report (such as a description of the issue, steps to reproduce, and any relevant logs or proof of concept). MSRC will review your report, contact you with a case number, and work with the appropriate product team to investigate and remediate the issue in accordance with Microsoft’s security response processes.