Hello World in NASM assembly for macOS (for 64 bit intel)

I won't promise this is done "the right way" (tm), I've never really used assembly but wanted to play around with it some.

It seems to work under macOS Big Sur.

Thanks

These, among other sources, where helpful:

• http://thexploit.com/secdev/mac-os-x-64-bit-assembly-system-calls/
• http://www.x86-64.org/documentation/abi.pdf
• http://michaux.ca/articles/assembly-hello-world-for-os-x