Add usage

README.md

@@ -7,7 +7,7 @@ This code intended for testing, demonstration, and integration engineering
 with OSes and hosting platforms.  Currently the code works with Linux and
 Apache, though we will be expanding it to other platforms.
 
-## Running the demo on Debian
+## Running the demo code on Debian
 
 ` sudo apt-get install python-pip python-crypto python-dev python-jsonschema python-augeas gcc python-m2crypto` 
 
@@ -26,3 +26,23 @@ uninstall dialog", "pip uninstall pythondialog")
 
 Debian packaging work will continue in the separate "debian" branch of this
 repo.
+
+## Command line usage
+
+
+sudo ./letsencrypt.py  (default authentication mode using pythondialog)
+                                                   
+options --text (text mode)                              
+--privkey= (specify privatekey file to use to generate the certificate)            
+--csr= (Use a specific CSR. If this is specified, privkey must also be             
+specified with the correct private key for the CSR)                                
+--server (list the ACME CA server address)                       
+--revoke (revoke a certificate)                                                    
+--view-checkpoints (Used to view available checkpoints and see what                
+configuration changes have been made)                                              
+--rollback=X (Revert the configuration X number of checkpoints)                    
+--redirect (Automatically redirect all HTTP traffic to HTTPS for the newly         
+authenticated vhost)                                                               
+--no-redirect (Skip the HTTPS redirect question, allowing both HTTP and            
+HTTPS)                                                                             
+--agree-eula (Skip the end user agreement screen)