docs: update the root README

[agdimech]

Reason for this change

Update ROOT README as it was outdated.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.80%. Comparing base (53f0b12) to head (0f0794f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   95.80%   95.80%           
=======================================
  Files          45       45           
  Lines        5511     5511           
  Branches      693      693           
=======================================
  Hits         5280     5280           
  Misses        224      224           
  Partials        7        7           

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