doc: Add macOS build instructions

12 jobs for master in 18 minutes and 3 seconds (queued for 2 seconds)
latest
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  Build
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librem5
api-visibility

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librem5
build-debian-clang

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librem5
build-debian-gcc

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passed #256321
librem5
build-fedora-gcc

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  Test+Docs
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librem5
build-gtkdoc

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passed #256323
librem5
unit-test

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  Package
passed #256324
librem5
package-debian-buster

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passed #256325
librem5:arm64
package-debian-buster:arm64

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passed #256326
flatpak
package-flatpak

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  Test Package
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librem5
autopkgtest-debian-buster-package

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librem5
lintian-debian-buster-package

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  Deploy
passed #256329
librem5
publish-docs

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