Add a reference of qtlicd CLI commands

Usage: qtlicd.exe [option] [value]
Supported options are:
  --version              : Version info
  --register <source>    : Registers itself in the 'installations.ini' file
       The <source> defines the entity calling this. E.g. 'installer'.
  --unregister           : Unregister itself from the 'installations.ini' file
  --add-key-value <key=value>
                         : Add additional key-value pair to the installations.ini on register
  --help                 : This help
  --install              : Installs the daemon executable as system service
  --delete               : Removes the daemon executable from system services
  --port <port number>   : Specify TCP/IP server port. If omitted, default is used.
  --log-level <loglevel> : Set logging level to be one of: none|info|warning|error|debug|silly
  --nostdout             : Do not print logs to stdout
  --nologfile            : Do not print logs into file
  --mode <mode>          : Set operating mode, required value must be one of:
       on-demand -  Run in on-demand mode (in user space)
       cli       -  Run in non-daemon mode (in console like any other CLI app)
       test      -  Run in test mode (for devs, not operable in real environment)
    Note: If launched from windows cmd line, mode is mandatory.Example: Run as CLI app, setting log level to 'debug'
> qtlicd --log-level debug --mode cli:

Supported environment variables are:
  QTLICD_LOG_LEVEL <loglevel>
                         : Set logging level to be one of: none|info|warning|error|debug|silly
  QTLICD_LICENSE_IMPORT_PATH <path>
                         : Set the path to import local licenses from (defaults to user's home)