Merge pull request #195 from spdx/Add-SECURITY.md

Create SECURITY.md file

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x   | :white_check_mark: |
+| 1.x  | :x: |
+| 0.x   | :x: |
+
+
+## Reporting a Vulnerability
+
+This repository has private reporting enabled. You can follow [these instructions](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability#privately-reporting-a-security-vulnerability) to report a vulnerability to the maintainers of this project. The maintainers will make a best-effort attempt to respond within two weeks.