Create SECURITY.md to enable the disclosure of security vulnerabilities (#181)

Author: nopcorn

SECURITY.md

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+# Security Policy
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+Thank you for helping to improve the security of StarTrack. This project is a small front-end application but we nevertheless appreciate your efforts to report any potential security issues.
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+To report a security issue, please use the GitHub Security Advisory "[Report a Vulnerability](https://github.com/seladb/StarTrack-js/security/advisories/new)" tab.