Add back make xcode in the Makefile

[nandodelauni]

🎩 What is the goal?

While trying to contribute to the project I realized that the make xcode action documented in the README is no longer available. The goal is to add it back.

🔨 How is it being implemented?

By adding the action to the Makefile file.

[cpisciotta]

Thanks for making this contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.85%. Comparing base (2891bc1) to head (b19f9c0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #310   +/-   ##
=======================================
  Coverage   86.85%   86.85%           
=======================================
  Files          14       14           
  Lines        1651     1651           
=======================================
  Hits         1434     1434           
  Misses        217      217           

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