Add MACOS install instructions

[ahcorde]

Signed-off-by: Alejandro Hernández [email protected]

🦟 Bug fix

Summary

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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

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[scpeters]

there is an easier way; we can do brew install --only-dependencies ignition-math6 and it will pull the dependencies from the homebrew formula

this is what we do in CI: https://github.com/ignition-tooling/release-tools/blob/master/jenkins-scripts/lib/project-default-devel-homebrew-amd64.bash#L72

[scpeters]

GUI -> Math

[scpeters]

brew install --only-dependencies ignition-math<#>

[codecov]

Codecov Report

Merging #252 (6ff4622) into ign-math6 (f3aeb27) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-math6     #252   +/-   ##
==========================================
  Coverage      99.41%   99.41%           
==========================================
  Files             67       67           
  Lines           6347     6347           
==========================================
  Hits            6310     6310           
  Misses            37       37           

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[ahcorde]

Thank your for the tips @scpeters !