Create a doc page for CLI options from Issue No #3

[nirmalchandra]

#3 : Has implemented CLI options. But no docs are there to refer for the options.

AC1:
This ticket is to create a Doc Wiki page here:
https://github.com/SUPAIDEAS/passifypdf/wiki/CLI-options-to-encrypt-and-decrypt-PDF-files

[ambicuity]

Resolved by creating docs/CLI_OPTIONS.md and bringing it into README.md.