Create SECURITY.md

SECURITY.md

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+<!--
+SPDX-FileCopyrightText: 2021-2024 Winni Neessen <wn@neessen.dev>
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
+# Security Policy
+
+## Reporting a Vulnerability
+
+To report (possible) security issues in apg-go, please either send a mail to 
+[security@neessen.dev](mailto:security@neessen.dev) or use Github's 
+[private reporting feature](https://github.com/wneessen/apg-go/security/advisories/new).
+Reports are always welcome. Even if you are not 100% certain that a specific issue you found
+counts as a security issue, we'd love to hear the details, so we can figure out together if
+the issue in question needds to be addressed.
+
+Typically, you will receive an answer within a day or even within a few hours.
+
+## Encryption
+You can send OpenPGP/GPG encrpyted mails to the [security@neessen.dev](mailto:security@neessen.dev) address.
+
+OpenPGP/GPG public key:
+```
+-----BEGIN PGP PUBLIC KEY BLOCK-----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+=nm5C
+-----END PGP PUBLIC KEY BLOCK-----
+```