Add security policy

PR-URL: #59

SECURITY.md

@@ -0,0 +1,18 @@
+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.x.x   | :x:                |
+| 1.x.x   | :x:                |
+| 2.0.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability, let us know by sending
+email to [[email protected]](mailto:[email protected])
+We will investigate that and do our best to quickly fix the problem.
+
+Please don't open an issue to or discuss this security vulnerability in a public
+place. Thanks for understanding!