Add SECURITY.md with vulnerability disclosure policy

Author: erik1o6

SECURITY.md

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+# Euler Security Policy
+
+## Vulnerability Disclosure and Bug Bounty
+
+Security is a top priority at Euler, and we engage in regular security reviews and have an active bug bounty program to ensure the integrity of our systems.  
+
+To report a vulnerability, **please submit it through our bug bounty program**:  
+[Euler Bug Bounty](https://euler.finance/bug-bounty)  
+
+**Reports sent via email will not be accepted.** Email should only be used for general security inquiries.
+
+## Security Team Contact Details
+
+For security-related questions or inquiries (not vulnerability reports), you can contact us via:  
+- **Email**: [[email protected]](mailto:[email protected])  
+- **PGP Encryption**: [Euler Public Key](https://euler.finance/.well-known/public-key.asc)  
+
+## Previous Security Reviews
+
+Euler undergoes regular security audits. You can find details of previous security reviews here:  
+[Euler Security Reviews](https://docs.euler.finance/security/security-reviews)  
+
+## Preferred Languages
+
+We accept security-related inquiries in **English (en)**