chore: readme

README.md

@@ -1,6 +1,19 @@
 # simple-ssh-server
 
-uses:
+# Login with FIDO
-https://github.com/gliderlabs/ssh
+
+OpenSSH 版本需要在8.2以上，版本查看方法如下：
+```
+$ ssh -V
+OpenSSH_8.6p1, OpenSSL 1.1.1k  25 Mar 2021
+```
+
+生成FIDO身份：
+```
+ssh-keygen -t ecdsa-sk [-C fido-u2f]
+```
 
 
+# dependencies
+* https://github.com/gliderlabs/ssh
+