Add SECURITY.md file

Signed-off-by: Wiktor Kwapisiewicz <[email protected]>

Author: wiktor-k

SECURITY.md

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+# Security policy
+
+If you have discovered a security vulnerability in this project, please report it privately.
+Do not disclose it as a public issue.
+This gives us time to work with you to fix the issue before public exposure, reducing the chance that the exploit will be used before a patch is released.
+
+This project is maintained by a team of volunteers on a reasonable-effort basis.
+As such, please give us at least 90 days to work on a fix before public exposure.
+We will contact you back within 2 business days after reporting the issue.
+
+Thanks for helping make the project safe for everyone!
+
+## Reporting a vulnerability
+
+Please, report the vulnerability either through [new security advisory form][ADV] or by directly contacting our security contacts.
+
+[ADV]: https://github.com/wiktor-k/ssh-agent-lib/security/advisories/new
+
+Security contacts:
+  - [Wiktor Kwapisiewicz][WK], preferably encrypted with the following OpenPGP certificate: [`6539 09A2 F0E3 7C10 6F5F AF54 6C88 57E0 D8E8 F074`][KEY].
+
+[WK]: https://github.com/wiktor-k
+[KEY]: https://keys.openpgp.org/vks/v1/by-fingerprint/653909A2F0E37C106F5FAF546C8857E0D8E8F074
+
+## Supported Versions
+
+Security updates are applied only to the most recent release.