feat: update readme

README.md

@@ -1,18 +1,43 @@
-Yubikey PIV PKCS#11
+# Yubikey PIV PKCS#11
 
-> Fork form: https://github.com/google/native-pkcs11
+> This project is forked form: https://github.com/google/native-pkcs11
 
 
 <br>
 
+## OpenSC pkcs11-tool
+
 Alias:
+
 ```shell
 alias p11='pkcs11-tool --module /FULLPATH/libyubikey_piv_pkcs11.dylib'
 ```
 
-List certificates
+List certificates:
+
 ```shell
 p11 --list-object --type cert
 ```
 
+## OpenSSH
+
+Alias:
+
+```shell
+alias sshp11='ssh -I /FULLPATH/libyubikey_piv_pkcs11.dylib'
+```
+
+SSH server:
+
+```shell
+sshp11 root@example.com
+```
+
+## Configuration
+
+Default retired slots are disabled, turn on:
+
+```shell
+export ENABLE_RETIRED=1
+```