add HID pre-release

firmware/firmwareupdate.md

@@ -24,6 +24,8 @@ If your card10 reboots during this operation, use the bootloader to copy the fil
 These releases are untested and must be considered faulty. Always create a backup of the files on your
 card10 before applying them. Please follow the steps mentioned above.
 
+- HID Support: https://card10.badge.events.ccc.de/release/card10-HID-r1.zip
+
 ---
 
 ## Previous Releases