new: [SECURITY] Added SECURITY.md file.

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Last stable version of the Freshermeat always provides security updates.
+There will be no security patches for other releases (tagged or not).
+
+## Reporting a Vulnerability
+
+If you think you have found a potential security issue, do not open
+directly a GitHub issue.
+Please open a GitHub security advisory:
+https://github.com/cedricbonhomme/freshermeat/security
+
+Or email me:
+https://www.cedricbonhomme.org/contact/
+
+You can also specify how you would like to be credited for your finding
+(commit message or release notes for the new release). We will
+respect your privacy and will only publicize your involvement if you
+grant us permission.