Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We fix security issues as soon as they are found, and release firmware updates.  
+Each such release is accompanied by release notes, see <https://github.com/solokeys/solo/releases>.
+
+The latest version can be determined using the file <https://github.com/solokeys/solo/blob/master/STABLE_VERSION>.
+
+To update your key:
+- either visit <https://update.solokeys.com>, or
+- use our commandline tool <https://github.com/solokeys/solo-python>:
+```
+solo key update [--secure|--hacker]
+```
+
+## Reporting a Vulnerability
+
+To report vulnerabilities you have found:
+
+- preferably contact [@conor1](https://keybase.io/conor1), [@0x0ece](https://keybase.io/0x0ece) or [@nickray](https://keybase.io/nickray) via Keybase, or
+- send us e-mail using OpenPGP to [security@solokeys.com](mailto:security@solokeys.com).
+
+<https://keys.openpgp.org/vks/v1/by-fingerprint/85AFA2769F4381E5712C36A04DDFC46FEF1F7F3F>
+
+We do not currently run a paid bug bounty program, but are happy to provide you with a bunch of Solo keys in recognition of your findings.
+
+## Mailing List
+
+Join our release notification mailing list to be informed about each release:
+
+https://sendy.solokeys.com/subscription?f=9MLIqMDmox1Ucz89C892Kq09IqYMM7OB8UrBrkvtTkDI763QF3L5PMYlRhlVNo2AI892mO