Adds API doc and CodeCov badges

[kailash-b]

✏️ Changes

Adds the API documentation reference and CodeCov as badges.

🔗 References

N / A

🎯 Testing

• This change adds unit test coverage

• This change adds integration test coverage

• This change has been tested on the latest version of the platform/language or why not

✅ Checklist

• I have read the Auth0 general contribution guidelines

• I have read the Auth0 Code of Conduct

• All existing and new tests complete without errors

• All commits are signed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.80%. Comparing base (e2cd8fb) to head (55924e4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #21   +/-   ##
=======================================
  Coverage   93.80%   93.80%           
=======================================
  Files          17       17           
  Lines         904      904           
  Branches       97       97           
=======================================
  Hits          848      848           
  Misses         37       37           
  Partials       19       19           

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