[PLUTO-1376] Improve readme/help command

[zhamborova]

This pr is just to clarify the usage of cli in Readme, and just some nice formatting for the help command

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.62%	✅ 0.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (dd841e6)	2274	598	26.30%
Head commit (ab6b168)	2329 (+55)	598 (+0)	25.68% (-0.62%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#63)	55	0	0.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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