docs: Add GrowthSimple to list of users on readme

[AnimeshAgrawal]

SUMMARY

Add GrowthSimple to list of users on readme

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-commenter]

Codecov Report

Merging #10075 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10075      +/-   ##
==========================================
- Coverage   70.50%   70.48%   -0.02%     
==========================================
  Files         585      585              
  Lines       31074    31074              
  Branches     3185     3185              
==========================================
- Hits        21909    21903       -6     
- Misses       9056     9061       +5     
- Partials      109      110       +1     

Flag	Coverage Δ
#cypress	53.82% <ø> (-0.10%)	⬇️
#javascript	59.50% <ø> (ø)
#python	70.07% <ø> (ø)

Impacted Files	Coverage Δ
...rontend/src/SqlLab/components/QueryAutoRefresh.jsx	65.90% <0.00%> (-6.82%)	⬇️
superset-frontend/src/SqlLab/actions/sqlLab.js	66.15% <0.00%> (-0.66%)	⬇️

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