Register ssh key with cygwin

[Đoàn Bảo Trung via Cygwin-apps]

Name: Trung Doan

---- BEGIN SSH2 PUBLIC KEY ----
Comment: "256-bit ED25519, converted by Trung Doan@TrungPC from OpenSS"
AAAAC3NzaC1lZDI1NTE5AAAAIHwmvMOZsZM8JIAkDK0eT/KXTGyedtvSVz6tJw6i29vb
---- END SSH2 PUBLIC KEY ----