Create SECURITY.md

Signed-off-by: Patrick Harböck <[email protected]>

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+These versions of gopassbridge are currently supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.x.x   | :white_check_mark: |
+| < 1.0   | :x:                |
+
+These browsers are actively supported for usage with gopassbridge:
+
+| Browser          | Supported          |
+| ---------------- | ------------------ |
+| Firefox ([latest Release version](https://www.mozilla.org/en-US/firefox/releases/)) | :white_check_mark: |
+| Chrome ([latest Stable version](https://chromereleases.googleblog.com/search/label/Stable%20updates))  | :white_check_mark: |
+| Edge             | :x:                |
+
+Other browsers or versions may work, but are only supported on a best-effort basis. 
+
+## Reporting a Vulnerability
+
+Please read the [gopass security policy](https://github.com/gopasspw/gopass/security) first.
+
+Please report security issues or vulnerabilities with the "Report a vulnerability" button [on GitHub](https://github.com/gopasspw/gopassbridge/security).
+
+In case you are unsure, please send an email to [email protected].