Add security policy

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We commit to publishing security updates for the last release of Slint:
+
+| Name | Description | URL |
+| ---- | ----------- | --- |
+| `slint` Rust crate | Rust crate for Slint API | https://crates.io/crates/slint |
+| `slint-interpreter` Rust crate | Rust crate for Slint interpreter API | https://crates.io/crates/slint-interpreter |
+| Slint for C++ | CMake package for Slint | https://github.com/slint-ui/slint/releases/latest |
+| `slint-ui` NPM package | Node.js API for Slint | https://www.npmjs.com/package/slint-ui |
+| `slint` Python Package | Python API for Slint | https://pypi.org/project/slint/ |
+
+## Reporting a Vulnerability
+
+Please report any vulnerabilities via the GitHub Private Vulnerability Disclosure functionality.
+
+Check out the [GitHub 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) on how to submit a report.
+