DOC: Readme for tpch benchmark script

[ChengjieLi28]

What do these changes do?

Related issue number

Fixes #xxxx

Check code requirements

• [ ] tests added / passed (if needed)
• [ ] Ensure all linting tests pass

[codecov[bot]]

Codecov Report

Merging #676 (60733ec) into main (8d7de72) will decrease coverage by 11.66%. The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #676       +/-   ##
===========================================
- Coverage   93.57%   81.92%   -11.66%     
===========================================
  Files        1026     1026               
  Lines       79812    79812               
  Branches    16563    16563               
===========================================
- Hits        74686    65385     -9301     
- Misses       3443    12185     +8742     
- Partials     1683     2242      +559     

Flag	Coverage Δ
unittests	81.79% <ø> (-11.68%)	:arrow_down:

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see 182 files with indirect coverage changes