Create SECURITY.md

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SECURITY.md

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+# Security Policy
+
+## js-cookie/js-cookie
+
+### Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| All | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please follow these steps:
+
+1. Send an email to `js-cookie [at] googlegroups[dot]com` with the subject line "Vulnerability Report".
+2. Provide a detailed description of the vulnerability, including steps to reproduce and any relevant information about the environment in which it was discovered.
+3. If applicable, include any proof-of-concept code or other supporting materials that can help demonstrate the vulnerability.
+4. Wait for a response from the project maintainers.
+
+Once your report is received, the project maintainers will review it and respond accordingly. We appreciate your responsible disclosure and will make every effort to address the issue in a timely manner.
+
+Thank you for helping us maintain the security of js-cookie!