Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+This project takes security seriously  —this is meant literally  —not like some companies claim after a breach or other security incident.
+
+The attack surface of testssl.sh is quite small and thus there should not be any serious blunders. We followed recommeded patterns, e.g. like validate inputs and a lot more.
+
+However this project was made by humans and despite our dedication there could be still security bugs. If you find one and the impact is not low, please use [Responsible
+Disclosure](https://en.wikipedia.org/wiki/Full_disclosure_(computer_security)#Coordinated_vulnerability_disclosure), see 
+[github docs](https://docs.github.com/en/enterprise-cloud@latest/code-security/how-tos/report-and-fix-vulnerabilities/report-privately) and report them *privately* . If you happen
+to have a PoC, it will be much appreciated but it is not mandatory. Using [Full Disclosure](https://en.wikipedia.org/wiki/Full_disclosure_(computer_security)#Full_disclosure) might be a problem for the people setting up a website using testssl.sh as a scanner or users.
+Also keep in mind that the maintainers here have a professional attitude but this project, it is a spare time project.
+
+
+## Supported Versions
+
+As said in the Readme.md we only support n-1 versions , n being the branch/minor version:
+
+| Branches | Supported          |
+| -------- | ------------------ |
+| 3.3dev   | :white_check_mark: |
+| 3.2.x    | :white_check_mark: |
+| 3.0.x    | :x:                |
+| <=2.9.5  | :x:                |
+
+For x (patch version) we expect your report to refer to the latest release. For the rolling release version (*dev) please refer to the latest and greatest @ github.
+