Create SECURITY.md

Author: patkon

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+General security issues and concerns are welcome in our [public Github issue tracker](https://github.com/SwiftyEdit/SwiftyEdit/issues)
+
+In case of a high risk of the reported vulnerability being exploited, please report it to [email protected] instead. Thank you in advance for taking the time to share this with us privately.
+
+---
+
+We will attempt to confirm the vulnerability and develop a solution if necessary. When we release the fix, we will publish a security advisory.
+
+Please let us know if you would like to be credited.
+
+Note: Reported vulnerabilities will be treated confidentially, and personal information should not be included in the public report.