chore(github): add SECURITY.md (#3132)

SECURITY.md

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+# Security Policy
+
+Popcorn Time takes the security seriously.
+
+If you believe you have found a security vulnerability in this repository, please report it responsibly.
+
+---
+
+## Reporting a Vulnerability
+
+> [!CAUTION]
+> Please do not report security vulnerabilities through public GitHub issues, discussions, or pull requests.
+
+- Use [private vulnerability reporting on GitHub](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) to submit directly.
+- Alternatively, email us at **hello@popcorntime.app**.
+
+---
+
+## Scope
+
+- Vulnerabilities in this repository and related Popcorn Time open-source code.
+- Popcorn Time apps and services operated under the official `popcorntime.app` domain.
+
+---
+
+## Rewards
+
+For severe vulnerabilities we may offer rewards as a token of appreciation, depending on impact and severity. While we cannot guarantee payouts for all reports, critical findings will be prioritized.
+
+---
+
+## Responsible Disclosure
+
+- Do not publicly disclose vulnerabilities until we have confirmed and addressed the issue.
+- We will work with you to verify the finding, assess severity, and publish a fix as quickly as possible.
+- Credit will be given to reporters who wish to be acknowledged.
+
+---
+
+Thanks for helping make Popcorn Time safer for everyone.