README: add MacPorts install info

[herbygillot]

jqp has been added to MacPorts: https://ports.macports.org/port/jqp/

[noahgorstein]

Hey @herbygillot. Thanks for this. Honestly, I'm pretty unfamiliar with MacPorts. Have not used it before myself. Did you add jqp there? If so, how is that done and if and when I push a new version of jqp, how does that get updated with the new release?

[herbygillot]

Hey there @noahgorstein, no worries.

Basically every piece of software in MacPorts has a "port". Folks volunteer to be maintainers for a port.

A Portfile is what defines a port and tells MacPorts how to build that port's software.

I have submitted a Portfile for jqp here: https://github.com/macports/macports-ports/blob/master/textproc/jqp/Portfile

As maintainer, when jqp gets updated, I'll update the Portfile accordingly.

Usually anyone can submit updates to ports as pull requests: https://github.com/macports/macports-ports/pulls

MacPorts end users install MacPorts onto their machines from https://www.macports.org/

That will then make the port command available, and then that can be used to install any port.

[noahgorstein]

Okay, awesome. Appreciate you explaining that and thanks for volunteering to maintain the port! I'll go ahead and merge this.