Add some information in readme for the coming repository changes

[jeffwubj]

What this PR does / why we need it

Which issue(s) this PR fixes

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[codecov[bot]]

Codecov Report

Merging #4558 (8ce92c9) into main (bb07e03) will decrease coverage by 0.85%. The diff coverage is n/a.

:exclamation: Current head 8ce92c9 differs from pull request most recent head d0f6c7c. Consider uploading reports for the commit d0f6c7c to get more accurate results

@@            Coverage Diff             @@
##             main    #4558      +/-   ##
==========================================
- Coverage   49.77%   48.93%   -0.85%     
==========================================
  Files         453      483      +30     
  Lines       45424    47544    +2120     
==========================================
+ Hits        22612    23264     +652     
- Misses      20652    22075    +1423     
- Partials     2160     2205      +45     

see 36 files with indirect coverage changes

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