docs: add more information

[snitin315]

What kind of change does this PR introduce?
Docs

Did you add tests for your changes?
NA
If relevant, did you update the documentation?
Yes
Summary

Add more useful information.

Does this PR introduce a breaking change?
No

Other information
No

[codecov]

Codecov Report

Merging #2683 (edc057d) into master (0fc3eec) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2683   +/-   ##
=======================================
  Coverage   96.00%   96.00%           
=======================================
  Files          30       30           
  Lines        1526     1526           
  Branches      432      432           
=======================================
  Hits         1465     1465           
  Misses         61       61           

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[anshumanv]

we can't maintain full documentation in 4 places, I don't think many people will even arrive at this readme.

We should keep this at root if at all we want this here given it's already in the docs page

[snitin315]

This readme renders on the official npm page https://www.npmjs.com/package/webpack-cli, nevertheless a link to the official docs https://webpack.js.org/api/cli/ should be present.

[anshumanv]

yep link makes sense 👍

[alexander-akait]

Sorry, too fast, feel free to send other PR and improve it more