Update studio README.md with badges

[gagb]

Why are these changes needed?

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2e519b0) 30.63% compared to head (5fae4a3) 30.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1225   +/-   ##
=======================================
  Coverage   30.63%   30.63%           
=======================================
  Files          32       32           
  Lines        4365     4365           
  Branches     1015     1015           
=======================================
  Hits         1337     1337           
  Misses       2932     2932           
  Partials       96       96           

Flag	Coverage Δ
unittests	30.58% <ø> (ø)

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