Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We release patches for security vulnerabilities under the following versions.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.x     | :white_check_mark: |
+| < 4.0   | :x:                |
+
+## Reporting a Vulnerability
+
+Please report (suspected) security vulnerabilities to
+**[security channel](https://t.me/YooptaEditor/180)**. You will receive a response from
+us within 48 hours. If the issue is confirmed, we will release a patch as soon
+as possible, usually within a few days.