feat: Add security policy (#2253)

Signed-off-by: John McBirde <jpmmcbride@gmail.com>

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+The `cobra` maintainers take security issues seriously and
+we appreciate your efforts to _**responsibly**_ disclose your findings.
+We will make every effort to swiftly respond and address concerns.
+
+To report a security vulnerability:
+
+1. **DO NOT** create a public GitHub issue for the vulnerability!
+2. **DO NOT** create a public GitHub Pull Request with a fix for the vulnerability!
+3. Send an email to `cobra-security@googlegroups.com`.
+4. Include the following details in your report:
+   - Description of the vulnerability
+   - Steps to reproduce
+   - Potential impact of the vulnerability (to your downstream project, to the Go ecosystem, etc.)
+   - Any potential mitigations you've already identified
+5. Allow up to 7 days for an initial response.
+   You should receive an acknowledgment of your report and an estimated timeline for a fix.
+6. (Optional) If you have a fix and would like to contribute your patch, please work
+   directly with the maintainers via `cobra-security@googlegroups.com` to
+   coordinate pushing the patch to GitHub, cutting a new release, and disclosing the change.
+
+## Response Process
+
+When a security vulnerability report is received, the `cobra` maintainers will:
+
+1. Confirm receipt of the vulnerability report within 7 days.
+2. Assess the report to determine if it constitutes a security vulnerability.
+3. If confirmed, assign the vulnerability a severity level and create a timeline for addressing it.
+4. Develop and test a fix.
+5. Patch the vulnerability and make a new GitHub release: the maintainers will coordinate disclosure with the reporter.
+6. Create a new GitHub Security Advisory to inform the broader Go ecosystem
+
+## Disclosure Policy
+
+The `cobra` maintainers follow a coordinated disclosure process:
+
+1. Security vulnerabilities will be addressed as quickly as possible.
+2. A CVE (Common Vulnerabilities and Exposures) identifier will be requested for significant vulnerabilities
+   that are within `cobra` itself.
+3. Once a fix is ready, the maintainers will:
+   - Release a new version containing the fix.
+   - Update the security advisory with details about the vulnerability.
+   - Credit the reporter (unless they wish to remain anonymous).
+   - Credit the fixer (unless they wish to remain anonymous, this may be the same as the reporter).
+   - Announce the vulnerability through appropriate channels
+     (GitHub Security Advisory, mailing lists, GitHub Releases, etc.)
+
+## Supported Versions
+
+Security fixes will typically only be released for the most recent major release.
+
+## Upstream Security Issues
+
+`cobra` generally will not accept vulnerability reports that originate in upstream
+dependencies. I.e., if there is a problem in Go code that `cobra` depends on,
+it is best to engage that project's maintainers and owners.
+
+This security policy primarily pertains only to `cobra` itself but if you believe you've
+identified a problem that originates in an upstream dependency and is being widely
+distributed by `cobra`, please follow the disclosure procedure above: the `cobra`
+maintainers will work with you to determine the severity and ecosystem impact.
+
+## Security Updates and CVEs
+
+Information about known security vulnerabilities and CVEs affecting `cobra` will
+be published as GitHub Security Advisories at
+https://github.com/spf13/cobra/security/advisories.
+
+All users are encouraged to watch the repository and upgrade promptly when
+security releases are published.
+
+## `cobra` Security Best Practices for Users
+
+When using `cobra` in your CLIs, the `cobra` maintainers recommend the following:
+
+1. Always use the latest version of `cobra`.
+2. [Use Go modules](https://go.dev/blog/using-go-modules) for dependency management.
+3. Always use the latest possible version of Go.
+
+## Security Best Practices for Contributors
+
+When contributing to `cobra`:
+
+1. Be mindful of security implications when adding new features or modifying existing ones.
+2. Be aware of `cobra`'s extremely large reach: it is used in nearly every Go CLI
+   (like Kubernetes, Docker, Prometheus, etc. etc.)
+3. Write tests that explicitly cover edge cases and potential issues.
+4. If you discover a security issue while working on `cobra`, please report it
+   following the process above rather than opening a public pull request or issue that
+   addresses the vulnerability.
+5. Take personal sec-ops seriously and secure your GitHub account: use [two-factor authentication](https://docs.github.com/en/authentication/securing-your-account-with-two-factor-authentication-2fa),
+   [sign your commits with a GPG or SSH key](https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification),
+   etc.
+
+## Acknowledgments
+
+The `cobra` maintainers would like to thank all security researchers and
+community members who help keep cobra, its users, and the entire Go ecosystem secure through responsible disclosures!!
+
+---
+
+*This security policy is inspired by the [Open Web Application Security Project (OWASP)](https://owasp.org/) guidelines and security best practices.*