Updated Usage (markdown)

Usage.md

@@ -545,6 +545,79 @@ Option: `--auth-file`
 
 This option should be used in cases when the web server requires proper client-side certificate and a private key for authentication. Supplied value should be a PEM formatted `key_file` that contains your certificate and a private key.
 
+Example of generation of a `key_file.txt` that is compatible with `--auth-file`:
+```
+$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout auth_file.key -out auth_file.pem &&\
+cat auth_file.key auth_file.pem > auth_file.txt && cat auth_file.txt
+Generating a 2048 bit RSA private key
+.........+++
+...........+++
+writing new private key to 'auth_file.key'
+-----
+You are about to be asked to enter information that will be incorporated
+into your certificate request.
+What you are about to enter is what is called a Distinguished Name or a DN.
+There are quite a few fields but you can leave some blank
+For some fields there will be a default value,
+If you enter '.', the field will be left blank.
+-----
+Country Name (2 letter code) [AU]:
+State or Province Name (full name) [Some-State]:
+Locality Name (eg, city) []:
+Organization Name (eg, company) [Internet Widgits Pty Ltd]:
+Organizational Unit Name (eg, section) []:
+Common Name (e.g. server FQDN or YOUR name) []:
+Email Address []:
+-----BEGIN PRIVATE KEY-----
+MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQCWM28J1ua2DINf
+VLU28oeJwQidL9vTRoGJR5pfBU6Mhu33Cv6RuVEJAfMWEKYDSbqbrEyy1zUiNTcG
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+fJkrlA16caVj3qGaX1lkm06OAA==
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
+MIIDXTCCAkWgAwIBAgIJALTHPlkIs/+KMA0GCSqGSIb3DQEBCwUAMEUxCzAJBgNV
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+VA==
+-----END CERTIFICATE-----
+```
 
 ### Ignore HTTP error 401 (Unauthorized)