Add new file

management/einfra-ssh.md

+# Change e-INFRA CZ SSH Key
+
+To change the SSH key associated with your e-INFRA CZ account, go to your [e-INFRA CZ account][1] and follow the instructions on how to change the SSH key.
+
+[1]: https://profile.e-infra.cz/profile/settings/sshKeys