added section for options in the configuration file

Options-and-Params.md

@@ -84,4 +84,27 @@ acme.sh  command ...[parameters]....
   **--ocsp-must-staple, --ocsp**        Generate ocsp must Staple extension.  
   **--auto-upgrade   [0|1]**            Valid for '--upgrade' command, indicating whether to upgrade automatically in future.  
   **--listen-v4**                       Force standalone/tls server to listen at ipv4.  
-  **--listen-v6**                       Force standalone/tls server to listen at ipv6.  
+  **--listen-v6**                       Force standalone/tls server to listen at ipv6.
+
+## Configuration file
+Options in the configuration file (`<domain_name>/<domain_name>.conf`) usually correspond to one of the above mentioned options:
+
+* **Le_Domain:** the domain passed by `--domain, -d`
+* **Le_Alt:**
+* **Le_Webroot:** web root folder (`--webroot, -w`)
+* **Le_PreHook:** command run before obtaining certificates (`--pre-hook`)
+* **Le_PostHook:** command run after obtaining/renewing certificates, success or not (`--post-hook`)
+* **Le_RenewHook:** run once for each successfully renewed certificate (`--renew-hook`)
+* **Le_API:**
+* **Le_Keylength:** domain key length (`--keylength, -k`)
+* **Le_LinkCert:**
+* **Le_LinkIssuer:**
+* **Le_CertCreateTime:** Unix time stamp of last successful certificate creation/renewal
+* **Le_CertCreateTimeStr:** same in human readable format
+* **Le_NextRenewTimeStr:** time when the cert should be renewed
+* **Le_NextRenewTime:** same as Unix time stamp
+* **Le_RealCertPath:** where the created certificate will be stored (`--certpath`)
+* **Le_RealCACertPath:** same for the intermediate cert (`--capath`)
+* **Le_RealKeyPath:** and the signing key
+* **Le_RealFullChainPath:** and the full certificate chain
+* **Le_ReloadCmd:** command to run after (successful) issue/renew, e.g. to reload the web server (`--reloadcmd`)