Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We support 2 tracks: 2.x and 1.x
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x     | :white_check_mark: |
+| 1.x     | :interrobang:      |
+| < 1.0   | :x:                |
+
+1.x has adtag support. We do not plan any active development there but we guarantee:
+
+1. Regular dependency updates
+2. Updates for Golang versions
+3. Security vulnerability fixes
+4. Merging small PRs
+
+2.x is in active development and have a full support.
+
+## Reporting a Vulnerability
+
+If you have found a vulnerability, please report about it to nineseconds@yandex.ru, telegram @9seconds or here in issues