updating readme.md

[JoshuaThadi]

Updated the README.md with improved information and formatting.

[google-cla]

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[JoshuaThadi]

@googlebot I signed it!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.60%. Comparing base (dfaca0e) to head (08f239e).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21311      +/-   ##
==========================================
+ Coverage   82.57%   82.60%   +0.02%     
==========================================
  Files         564      565       +1     
  Lines       54677    54772      +95     
  Branches     8500     8508       +8     
==========================================
+ Hits        45152    45243      +91     
- Misses       7435     7439       +4     
  Partials     2090     2090              

Flag	Coverage Δ
keras	82.41% <ø> (+0.02%)	⬆️
keras-jax	63.55% <ø> (-0.06%)	⬇️
keras-numpy	58.70% <ø> (-0.04%)	⬇️
keras-openvino	33.13% <ø> (+0.08%)	⬆️
keras-tensorflow	63.96% <ø> (-0.07%)	⬇️
keras-torch	63.62% <ø> (-0.06%)	⬇️

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