add security policy

SECURITY.md

@@ -0,0 +1,19 @@
+# Security Policy
+
+## Supported Versions
+
+The following version of the `pluto-theme-mode` library is currently supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.9   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+To report a vulnerability in `pluto-theme-mode`, please submit an issue on the [GitHub Issues page](https://github.com/ChakkritGit/pluto-theme-mode/issues). We aim to respond to reported vulnerabilities within 48 hours.
+
+### What to Expect:
+- If the vulnerability is accepted, we will investigate and release a fix as quickly as possible.
+- If the vulnerability is declined, you will be notified, and we will provide an explanation.
+
+Thank you for helping us keep the `pluto-theme-mode` library secure!