feat: add check saml example to readme

README.md

@@ -102,6 +102,17 @@ For usage instructions, run:
 check_saml --help
 ```
 
+Example:
+
+```sh
+python3 check_saml.py
+    --username "my_username"
+    --password "my_password"
+    --username-field "j_username"
+    --password-field "j_password"
+    --postlogout-string "Successful logout"
+```
+
 ### check_user_logins.py
 
 Check users which login in repeatedly more often than a specified threshold (logins per seconds).