Create SECURITY.md

Author: edublancas

SECURITY.md

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+## Security Vulnerability Reporting
+
+If you've discovered a security vulnerability in this project, please report it responsibly through one of the following official channels:
+
+### Preferred Method: GitHub Security Advisories
+1. Go to the **Security** tab of this repository
+2. Click **Report a vulnerability**
+3. Fill out the private vulnerability report form
+
+### Alternative: Email
+Send details to: `security@ploomber.io`
+
+### What to Include
+- Description of the vulnerability
+- Steps to reproduce
+- Potential impact assessment
+- Suggested fix (if available)
+
+### What to Expect
+- Acknowledgment within 48 hours
+- Regular updates on our investigation
+- Credit in our security advisory (if desired)
+
+### Please Do Not
+- Open public issues for security vulnerabilities
+- Contact individual team members directly
+- Join our communication channels to report vulnerabilities
+
+We take security seriously and appreciate responsible disclosure practices.