Create security.md

Author: Carlgo11

.github/security.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.4   | :white_check_mark: |
+| 2.3   | :white_check_mark: |
+| <= 2.2 | :x: |
+| 1.x   | :x: |
+
+## Reporting a Vulnerability
+
+TempFiles take security seriously. If you find a potential security vulnerbility please first contact us privetly before disclosing it publicly.
+That way we can ensure that the user impact is as small as possible.
+
+Here are some ways you can contact me:
+* [Keybase](https://keybase.io/carlgo11)
+* [Twitter](https://twitter.com/carlgo11/)
+* [Contact form](https://carlgo11.com/contact/)