update readme - lower use cases to the ground

[shcheklein]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.29%. Comparing base (403c794) to head (3e2b94f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #668      +/-   ##
==========================================
- Coverage   87.32%   87.29%   -0.03%     
==========================================
  Files         113      113              
  Lines       10729    10729              
  Branches     1469     1469              
==========================================
- Hits         9369     9366       -3     
- Misses        986      988       +2     
- Partials      374      375       +1     

Flag	Coverage Δ
datachain	87.24% <ø> (-0.03%)	⬇️

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