Add installation instructions for macOS

[azeey]

🎉 New feature

Summary

The instructions mention the nightlies, but that wasn't helpful for macOS.

Checklist

• [ ] Signed all commits for DCO
• [ ] Added tests
• [ ] Added example and/or tutorial
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov[bot]]

Codecov Report

Merging #110 (a593eb3) into main (6b3fa2c) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files          24       24           
  Lines        1171     1171           
=======================================
  Hits         1116     1116           
  Misses         55       55           

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