Add build instructions for other platforms

[paulfloyd]

As a FreeBSD user I'd rather not have to reverse engineer the GH build scripts.

[CJCombrink]

Hi @paulfloyd

Thanks for reaching out.
I am not familiar with FreeBSD, out of curiosity, how or where do you get Qt Creator for FreeBSD?
Perhaps it might be some clue for me to try and assist?

A good starting point would be to look at the README before I removed the steps: README.md
It would at least guide you to getting Hunspell installed through vcpkg and information about building or getting Qt Creator build artefacts.

Everything from there where qmake is mentioned did however change to cmake.
I will see tonight if I can't add a few more pointers to try and assist.

If there is sufficient need I see this GH action might be useful: cross-platform-action
for me to consider supporting FreeBSD in future.

[paulfloyd]

I use the ports package system to install Qt Creator: https://www.freshports.org/devel/qtcreator/
I'll ask to see if anyone is interested in making a making a port of your plugin. I'll also try to dig out the README.