Add sub-command alternative to the readme

[janosimas]

fix #923

[sagiegurari]

@janosimas thanks for this and docs are great, but can you do a minor fix?
the readme.md is actually generated from both nav.md and content.md.
you need to update those files and not the readme file otherwise your content will be deleted.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -22.94% ⚠️

Comparison is base (098cef8) 92.88% compared to head (b13dbcc) 69.94%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #937       +/-   ##
===========================================
- Coverage   92.88%   69.94%   -22.94%     
===========================================
  Files         118      118               
  Lines       23727    23657       -70     
===========================================
- Hits        22038    16547     -5491     
- Misses       1689     7110     +5421     

see 64 files with indirect coverage changes

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[sagiegurari]

@janosimas just making sure you saw my comment

[janosimas]

Hi @sagiegurari , sorry, it has been some hectic days.
It is in my todo list.

[janosimas]

I rebased and updated nav.md and content.md

[sagiegurari]

@janosimas this is great, thanks a lot.
will merge and generate the readme later today