File usage.txt artifact 20bb7056fa part of check-in 73118f183b

::pki::pkcs11::loadmodule <filename>                       -> handle
::pki::pkcs11::listslots  <handle>                         -> list: slot flags
::pki::pkcs11::listcerts  <handle> <slot>                  -> list: certId cert 
::pki::pkcs11::login <handle> <slot> <password>            -> true/false
::pki::pkcs11::logout <handle> <slot>                      -> true/false
::pki::pkcs11::sign <handle> <slot> <certId> <data>        -> data
::pki::pkcs11::decrypt <handle> <slot> <certId> <data>     -> data
::pki::pkcs11::unloadmoule <handle>                        -> true/false