Add isabel as a codeowner

[epicadk]

Refer anitab-org/mentorship-android#1134 (comment)

[codecov]

Codecov Report

Merging #1103 (2ea4e26) into develop (23f28d8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1103   +/-   ##
========================================
  Coverage    92.90%   92.90%           
========================================
  Files           38       38           
  Lines         2073     2073           
========================================
  Hits          1926     1926           
  Misses         147      147           

[isabelcosta]

Thank you so much @epicadk for doing this!

[welcome]

Woohoo!🎊 Congrats on merging your first contribution to mentorship-backend!✨
Your code is officially a part of AnitaB.org Open Source now!! Time for a celebration 🙌🎉⚡️
Feel free to explore more on this project.🤗
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