[docs] add description for CLI optiions

[nokazn]

Hi, there. This PR has only tiny change. I found some implicit CLI options, and added them to README.md.

Types of changes

• [ ] Bug fixes
  • ~~resolves #~~
• [ ] Features
  • ~~resolves #~~
• [ ] Maintenance
• [x] Documentation

Changes

• fix typo of CLI options (--outputdir)
• add undocumented CLI options

Additional context

N/A

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