Create SECURITY.md

Author: cdavernas

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+The Serverless Workflow team and community take security bugs very seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+To report a security issue, please use the GitHub Security Advisory ["Report a Vulnerability"](https://github.com/serverlessworkflow/specification/security/advisories/new) tab.
+
+The Serverless Workflow team will send a response indicating the next steps in handling your report. After the initial reply to your report, the security team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.
+
+## Security Best Practices
+
+To help ensure the security of your workflows, we recommend the following best practices:
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+- **Keep Up to Date**: Always use the latest version of the Serverless Workflow DSL.
+- **Review Code**: Regularly review your workflows and code for potential security issues.
+- **Access Control**: Implement proper access controls to restrict who can create, modify, or execute workflows.
+- **Monitor and Audit**: Continuously monitor and audit workflows to detect and respond to any suspicious activities.
+- **Secure External Resources**: Ensure that any resources external to a workflow definition are always secured using modern authentication policies as defined in the DSL.
+- **Use Trusted Containers and Scripts**: When relying on [run tasks](https://github.com/serverlessworkflow/specification/blob/main/dsl-reference.md#run), only use trusted container images, scripts, commands and workflows.
+- **Custom Functions**: Only use custom functions from the [Serverless Workflow Catalog](https://github.com/serverlessworkflow/catalog) or from trusted sources to avoid introducing vulnerabilities.
+  
+---
+
+Thank you for helping to keep the Serverless Workflow DSL secure!